update dartdoc, markdown in DEPS

BUG=
R=brianwilkerson@google.com

Review URL: https://codereview.chromium.org//1284333004 .

DEPS

@@ -49,7 +49,7 @@ vars = {
   "collection_rev": "@1da9a07f32efa2ba0c391b289e2037391e31da0e",
   "crypto_rev" : "@2df57a1e26dd88e8d0614207d4b062c73209917d",
   "csslib_tag" : "@0.12.0",
-  "dartdoc_tag" : "@v0.4.0",
+  "dartdoc_tag" : "@v0.5.0",
   "dart_services_rev" : "@7aea2574e6f3924bf409a80afb8ad52aa2be4f97",
   "dart_style_tag": "@0.2.0",
   "dev_compiler_rev": "@0.1.3",
@@ -68,7 +68,7 @@ vars = {
   "json_rpc_2_tag": "@1.1.1",
   "linter_tag": "@0.1.0",
   "logging_rev": "@85d83e002670545e9039ad3985f0018ab640e597",
-  "markdown_rev": "@56b0fd6c018d6103862d07e8e27407b9ea3b963d",
+  "markdown_rev": "@9a1071a859df9c9edd4f556e948f898f70bf1e5e",
   "matcher_tag": "@0.12.0",
   "metatest_rev": "@e5aa8e4e19fc4188ac2f6d38368a47d8f07c3df1",
   "mime_rev": "@75890811d4af5af080351ba8a2853ad4c8df98dd",
@@ -222,8 +222,8 @@ deps = {
   Var("dart_root") + "/third_party/pkg/logging":
       (Var("github_mirror") % "logging") + Var("logging_rev"),
   Var("dart_root") + "/third_party/pkg/markdown":
-      "https://chromium.googlesource.com/external/github.com" +
-      "/dpeek/dart-markdown.git" + Var("markdown_rev"),
+      "https://github.com/dart-lang/" +
+      "markdown.git" + Var("markdown_rev"),
   Var("dart_root") + "/third_party/pkg/matcher":
       (Var("github_mirror") % "matcher") + Var("matcher_tag"),
   Var("dart_root") + "/third_party/pkg/metatest":

pkg/docgen/pubspec.yaml

@@ -5,7 +5,7 @@ homepage: https://www.dartlang.org/
 dependencies:
   args: '>=0.9.0 <0.14.0'
   logging: '>=0.9.0 <0.12.0'
-  markdown: 0.7.1+2
+  markdown: ^0.7.1+2
   path: '>=0.9.0 <2.0.0'
   yaml: '>=0.9.0 <3.0.0'
 dev_dependencies: