Move third_party/gsutil dependency from github to cloud storage

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 29 matching lines @@
   "collection_rev": "@f6135e6350c63eb3f4dd12953b8d4363faff16fc",
   "convert_tag": "@1.0.0",
   "crypto_rev" : "@2df57a1e26dd88e8d0614207d4b062c73209917d",
   "csslib_tag" : "@0.12.0",
   "dart2js_info_rev" : "@0a221eaf16aec3879c45719de656680ccb80d8a1",
   "dartdoc_tag" : "@v0.8.4",
   "dart_services_rev" : "@7aea2574e6f3924bf409a80afb8ad52aa2be4f97",
   "dart_style_tag": "@0.2.2",
   "dev_compiler_rev": "@0.1.9",
   "glob_rev": "@704cf75e4f26b417505c5c611bdaacd8808467dd",
-  "gsutil_rev" : "@4af393661a48e69dab038bf6440e7750ea49b085",
   "html_tag" : "@0.12.1+1",
   "http_rev" : "@9b93e1542c753090c50b46ef1592d44bc858bfe7",
   "http_multi_server_tag" : "@2.0.0",
   "http_parser_tag" : "@1.1.0",
   "http_throttle_rev" : "@a81f08be942cdd608883c7b67795c12226abc235",
   "idl_parser_rev": "@6316d5982dc24b34d09dd8b10fbeaaff28d83a48",
   "intl_rev": "@a8b480b9c436f6c0ec16730804c914bdb4e30d53",
   "jinja2_rev": "@2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rpc_2_tag": "@1.1.1",
   "linter_rev": "@5a599fd32d3b6ef00ffa7c330d1f32bbad287228",
@@ skipping 107 matching lines @@
   Var("dart_root") + "/third_party/pkg_tested/dart_style":
       (Var("github_mirror") % "dart_style") + Var("dart_style_tag"),
   Var("dart_root") + "/third_party/pkg/dart2js_info":
       (Var("github_mirror") % "dart2js_info") + Var("dart2js_info_rev"),
   Var("dart_root") + "/third_party/pkg/dartdoc":
       (Var("github_mirror") % "dartdoc") + Var("dartdoc_tag"),
   Var("dart_root") + "/third_party/pkg/dev_compiler":
       (Var("github_mirror") % "dev_compiler") + Var("dev_compiler_rev"),
   Var("dart_root") + "/third_party/pkg/glob":
       (Var("github_mirror") % "glob") + Var("glob_rev"),
-  Var("dart_root") + "/third_party/gsutil":
-      "https://github.com/GoogleCloudPlatform/gsutil.git" + Var("gsutil_rev"),
   Var("dart_root") + "/third_party/pkg/html":
       (Var("github_mirror") % "html") + Var("html_tag"),
   Var("dart_root") + "/third_party/pkg/http":
       (Var("github_mirror") % "http") + Var("http_rev"),
   Var("dart_root") + "/third_party/pkg/http_multi_server":
       (Var("github_mirror") % "http_multi_server") +
       Var("http_multi_server_tag"),
   Var("dart_root") + "/third_party/pkg/http_parser":
       (Var("github_mirror") % "http_parser") + Var("http_parser_tag"),
   Var("dart_root") + "/third_party/pkg/http_throttle":
@@ skipping 201 matching lines @@
       "--no_auth",
       "--no_resume",
       "--bucket",
       "dart-dependencies",
       "--platform=win32",
       "--extract",
       "-s",
       Var('dart_root') + "/third_party/7zip.tar.gz.sha1",
     ],
   },
+  {
+    "name": "gsutil",
+    "pattern": ".",
+    "action": [
+      "download_from_google_storage",
+      "--no_auth",
+      "--no_resume",
+      "--bucket",
+      "dart-dependencies",
+      "--extract",
+      "-s",
+      Var('dart_root') + "/third_party/gsutil.tar.gz.sha1",
+    ],
+  },
 ]