py3: remove @org_pythonhosted_six deps

Summary:
As of the previous sequence of changes, none of our code uses `six`. We
still keep it in the build workspace because protobuf requires that it
exist there (see comment in `third_party/python.bzl`), but we can remove
all dependency edges from our code to `@org_pythonhosted_six`.

Generated with:

```
buildozer //tensorboard/...:all 'remove deps @org_pythonhosted_six'
```

Test Plan:
It suffices that all tests pass both here and in a test sync.

wchargin-branch: py3-no-six-deps

Author: wchargin

tensorboard/BUILD

@@ -75,19 +75,13 @@ py_test(
     srcs_version = "PY3",
     tags = ["support_notf"],
     visibility = ["//tensorboard:internal"],
-    deps = [
-        ":lib",
-        "@org_pythonhosted_six",
-    ],
+    deps = [":lib"],
 )
 
 py_library(
     name = "auth",
     srcs = ["auth.py"],
     srcs_version = "PY3",
-    deps = [
-        "@org_pythonhosted_six",
-    ],
 )
 
 py_test(
@@ -148,7 +142,6 @@ py_library(
     deps = [
         ":version",
         "//tensorboard/util:tb_logging",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -164,7 +157,6 @@ py_test(
         ":test",
         ":version",
         "//tensorboard/util:tb_logging",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -185,7 +177,6 @@ py_test(
     deps = [
         ":manager",
         "//tensorboard:expect_tensorflow_installed",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -213,7 +204,6 @@ py_library(
         "//tensorboard/backend/event_processing:event_file_inspector",
         "//tensorboard/data:server_ingester",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -230,7 +220,6 @@ py_test(
         "//tensorboard/plugins:base_plugin",
         "//tensorboard/plugins/core:core_plugin",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -242,7 +231,6 @@ py_library(
     deps = [
         "//tensorboard:expect_absl_testing_absltest_installed",
         "//tensorboard/util:tb_logging",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -523,7 +511,6 @@ py_binary(
         "//tensorboard:expect_tensorflow_installed",
         "//tensorboard/util:encoder",
         "//tensorboard/util:tb_logging",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -537,7 +524,6 @@ py_library(
         "//tensorboard/backend:experiment_id",
         "@org_mozilla_bleach",
         "@org_pythonhosted_markdown",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -552,7 +538,6 @@ py_test(
         ":plugin_util",
         ":test",
         "//tensorboard/backend:experiment_id",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -574,8 +559,5 @@ py_test(
     srcs = ["lazy_test.py"],
     srcs_version = "PY3",
     tags = ["support_notf"],
-    deps = [
-        ":lazy",
-        "@org_pythonhosted_six",
-    ],
+    deps = [":lazy"],
 )

tensorboard/backend/BUILD

@@ -13,7 +13,6 @@ py_library(
     deps = [
         ":json_util",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -27,7 +26,6 @@ py_test(
         ":http_util",
         "//tensorboard:test",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -68,7 +66,6 @@ py_library(
         "//tensorboard/plugins/core:core_plugin",
         "//tensorboard/util:tb_logging",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )
 

tensorboard/backend/event_processing/BUILD

@@ -13,7 +13,6 @@ py_library(
     deps = [
         "//tensorboard/compat:tensorflow",
         "//tensorboard/util:tb_logging",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -25,7 +24,6 @@ py_test(
     deps = [
         ":io_wrapper",
         "//tensorboard:expect_tensorflow_installed",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -68,7 +66,6 @@ py_library(
         "//tensorboard/data:provider",
         "//tensorboard/util:tb_logging",
         "//tensorboard/util:tensor_util",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -91,7 +88,6 @@ py_test(
         "//tensorboard/plugins/scalar:metadata",
         "//tensorboard/plugins/scalar:summary_v2",
         "//tensorboard/util:tensor_util",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -186,7 +182,6 @@ py_test(
         "//tensorboard:expect_tensorflow_installed",
         "//tensorboard/compat/proto:protos_all_py_pb2",
         "//tensorboard/summary/writer",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -202,7 +197,6 @@ py_test(
         "//tensorboard/compat:no_tensorflow",
         "//tensorboard/compat/proto:protos_all_py_pb2",
         "//tensorboard/summary/writer",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -274,7 +268,6 @@ py_test(
         "//tensorboard/util:tb_logging",
         "//tensorboard/util:tensor_util",
         "//tensorboard/util:test_util",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -291,7 +284,6 @@ py_library(
         ":event_accumulator",
         ":io_wrapper",
         "//tensorboard/util:tb_logging",
-        "@org_pythonhosted_six",
     ],
 )
 

tensorboard/compat/proto/BUILD

@@ -309,6 +309,5 @@ py_test(
     deps = [
         ":protos_all_py_pb2",
         "//tensorboard:expect_tensorflow_installed",
-        "@org_pythonhosted_six",
     ],
 )

tensorboard/compat/tensorflow_stub/BUILD

@@ -18,7 +18,6 @@ py_library(
         "//tensorboard:expect_absl_flags_installed",
         "//tensorboard:expect_numpy_installed",
         "//tensorboard/compat/proto:protos_all_py_pb2",
-        "@org_pythonhosted_six",
     ],
 )
 

tensorboard/data/BUILD

@@ -19,10 +19,7 @@ py_library(
     name = "provider",
     srcs = ["provider.py"],
     srcs_version = "PY3",
-    deps = [
-        "//tensorboard:expect_numpy_installed",
-        "@org_pythonhosted_six",
-    ],
+    deps = ["//tensorboard:expect_numpy_installed"],
 )
 
 py_test(
@@ -35,7 +32,6 @@ py_test(
         ":provider",
         "//tensorboard:expect_numpy_installed",
         "//tensorboard:test",
-        "@org_pythonhosted_six",
     ],
 )
 

tensorboard/data/experimental/BUILD

@@ -61,8 +61,5 @@ py_binary(
     name = "test_binary",
     srcs = ["test_binary.py"],
     srcs_version = "PY3",
-    deps = [
-        "//tensorboard/data/experimental:experiment_from_dev",
-        "@org_pythonhosted_six",
-    ],
+    deps = ["//tensorboard/data/experimental:experiment_from_dev"],
 )

tensorboard/plugins/BUILD

@@ -10,9 +10,6 @@ py_library(
     srcs = ["base_plugin.py"],
     srcs_version = "PY3",
     visibility = ["//visibility:public"],
-    deps = [
-        "@org_pythonhosted_six",
-    ],
 )
 
 py_test(
@@ -22,6 +19,5 @@ py_test(
     deps = [
         ":base_plugin",
         "//tensorboard:test",
-        "@org_pythonhosted_six",
     ],
 )

tensorboard/plugins/audio/BUILD

@@ -19,7 +19,6 @@ py_library(
         "//tensorboard/data:provider",
         "//tensorboard/plugins:base_plugin",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -39,7 +38,6 @@ py_test(
         "//tensorboard/plugins:base_plugin",
         "//tensorboard/util:test_util",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -62,7 +60,6 @@ py_test(
         "//tensorboard/plugins:base_plugin",
         "//tensorboard/util:test_util",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -114,7 +111,6 @@ py_binary(
     deps = [
         ":summary",
         "//tensorboard:expect_tensorflow_installed",
-        "@org_pythonhosted_six",
     ],
 )
 

tensorboard/plugins/core/BUILD

@@ -15,7 +15,6 @@ py_library(
         "//tensorboard/plugins:base_plugin",
         "//tensorboard/util:tb_logging",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )
 
@@ -34,6 +33,5 @@ py_test(
         "//tensorboard/plugins:base_plugin",
         "//tensorboard/util:test_util",
         "@org_pocoo_werkzeug",
-        "@org_pythonhosted_six",
     ],
 )