Remove old versions of barback from checkout

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
   "third_party": "http://dart.googlecode.com/svn/third_party",
 
-  # The svn location for pulling pinned revisions of bleeding edge dependencies.
-  "bleeding_edge": "http://dart.googlecode.com/svn/branches/bleeding_edge",
-
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
 
   # We use mirrors of all github repos to guarantee reproducibility and
   # consistency between what users see and what the bots see.
   # We need the mirrors to not have 100+ bots pulling github constantly.
   # We mirror our github repos on chromium git servers.
   # DO NOT use this var if you don't see a mirror here:
   #   https://chromium.googlesource.com/
@@ skipping 267 matching lines @@
       (Var("github_mirror") % "watcher") + Var("watcher_tag"),
   Var("dart_root") + "/third_party/pkg/web_components":
       (Var("github_mirror") % "web-components") +
       Var("web_components_rev"),
   Var("dart_root") + "/third_party/pkg/when":
       (Var("github_mirror") % "when") + Var("when_tag"),
   Var("dart_root") + "/third_party/pkg/which":
       (Var("github_mirror") % "which") + Var("which_tag"),
   Var("dart_root") + "/third_party/pkg/yaml":
       (Var("github_mirror") % "yaml") + Var("yaml_tag"),
-
-  # These specific versions of barback and source_maps are used for testing and
-  # should be pulled from bleeding_edge even on channels.
-  Var("dart_root") + "/third_party/pkg/barback-0.13.0":
-      Var("bleeding_edge") + "/dart/pkg/barback" + Var("barback-0.13.0_rev"),
-  Var("dart_root") + "/third_party/pkg/barback-0.14.0+3":
-      Var("bleeding_edge") + "/dart/pkg/barback" + Var("barback-0.14.0_rev"),
-  Var("dart_root") + "/third_party/pkg/barback-0.14.1+4":
-      Var("bleeding_edge") + "/dart/pkg/barback" + Var("barback-0.14.1_rev"),
-  Var("dart_root") + "/third_party/pkg/source_maps-0.9.4":
-      Var("bleeding_edge") + "/dart/pkg/source_maps" +
-      Var("source_maps-0.9.4_rev"),
 }
 
 deps_os = {
   "android": {
     Var("dart_root") + "/third_party/android_tools":
       Var("chromium_git") + "/android_tools.git" +
       "@aaeda3d69df4b4352e3cac7c16bea7f16bd1ec12",
   },
   "win": {
     Var("dart_root") + "/third_party/cygwin":
@@ skipping 54 matching lines @@
       "--bucket",
       "dart-dependencies",
       "--recursive",
       "--auto_platform",
       "--extract",
       "--directory",
       Var('dart_root') + "/tools/sdks",
     ],
   },
 ]