Remove outdated support for chrome-only apis

DEPS

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 vars = {
   # The dart_root is the root of our sdk checkout. This is normally
   # simply sdk, but if using special gclient specs it can be different.
   "dart_root": "sdk",
 
   # The svn location to pull out dependencies from
@@ skipping 135 matching lines @@
   Var("dart_root") + "/third_party/ply":
       Var("chromium_git") + "/chromium/src/third_party/ply.git" +
       Var("ply_rev"),
 
   Var("dart_root") + "/third_party/idl_parser":
       Var("chromium_git") + "/chromium/src/tools/idl_parser.git" +
       Var("idl_parser_rev"),
 
   Var("dart_root") + "/third_party/7zip":
      Var("third_party") + "/7zip" + Var("7zip_rev"),
-  Var("dart_root") + "/third_party/chrome":
-      Var("third_party") + "/chrome" + Var("chrome_rev"),
   Var("dart_root") + "/third_party/pkg/fake_async":
       Var("third_party") + "/fake_async" + Var("fake_async_rev"),
   Var("dart_root") + "/third_party/firefox_jsshell":
       Var("third_party") + "/firefox_jsshell" + Var("firefox_jsshell_rev"),
   Var("dart_root") + "/third_party/font-awesome":
       Var("third_party") + "/font-awesome" + Var("font_awesome_rev"),
   Var("dart_root") + "/third_party/gsutil":
       Var("third_party") + "/gsutil" + Var("gsutil_rev"),
   Var("dart_root") + "/third_party/pkg/petitparser":
       Var("third_party") + "/petitparser" + Var("petitparser_rev"),
@@ skipping 217 matching lines @@
       "--bucket",
       "dart-dependencies",
       "--recursive",
       "--auto_platform",
       "--extract",
       "--directory",
       Var('dart_root') + "/tools/sdks",
     ],
   },
 ]