Roll src/third_party/dart d5c38cd..983f882 (8 commits) (#17747)

DEPS

@@ -34,7 +34,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'd5c38cd35486bbe6f7c77a9c013db6eb82683a23',
+  'dart_revision': '983f882180cdfec98b9e2dde5a0e3fb013c93ebf',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -70,7 +70,6 @@ vars = {
   'dart_mockito_tag': 'd39ac507483b9891165e422ec98d9fb480037c8b',
   'dart_mustache_tag': '5e81b12215566dbe2473b2afd01a8a8aedd56ad9',
   'dart_oauth2_tag': '1.2.1',
-  'dart_observatory_pub_packages_rev': '0894122173b0f98eb08863a7712e78407d4477bc',
   'dart_package_config_tag': 'v1.9.2',
   'dart_path_tag': '1.7.0',
   'dart_pedantic_tag': 'v1.9.0',
@@ -196,9 +195,6 @@ deps = {
   'src/third_party/dart/pkg/analysis_server/language_model':
    {'packages': [{'version': 'lIRt14qoA1Cocb8j3yw_Fx5cfYou2ddam6ArBm4AI6QC', 'package': 'dart/language_model'}], 'dep_type': 'cipd'},
 
-  'src/third_party/dart/third_party/observatory_pub_packages':
-   Var('dart_git') + '/observatory_pub_packages.git' + '@' + Var('dart_observatory_pub_packages_rev'),
-
   'src/third_party/dart/third_party/pkg/args':
    Var('dart_git') + '/args.git' + '@' + Var('dart_args_tag'),
 
@@ -233,7 +229,7 @@ deps = {
    Var('dart_git') + '/dart2js_info.git' + '@' + Var('dart_dart2js_info_tag'),
 
   'src/third_party/dart/third_party/pkg/dartdoc':
-   Var('dart_git') + '/dartdoc.git@v0.30.3',
+   Var('dart_git') + '/dartdoc.git@v0.30.4',
 
   'src/third_party/dart/third_party/pkg/ffi':
    Var('dart_git') + '/ffi.git' + '@' + Var('dart_ffi_tag'),