Switch to downloaded SDK executable, drop executables in testing/bin.

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",
 
   # We use mirrors of all github repos to guarantee reproducibility and
@@ skipping 275 matching lines @@
 }
 
 # TODO(iposva): Move the necessary tools so that hooks can be run
 # without the runtime being available.
 hooks = [
   {
     "pattern": ".",
     "action": ["python", Var("dart_root") + "/tools/gyp_dart.py"],
   },
   {
-    'name': 'checked_in_dart_binaries',
-    'pattern': '.',
-    'action': [
-      'download_from_google_storage',
-      '--no_auth',
-      '--no_resume',
-      '--bucket',
-      'dart-dependencies',
-      '--recursive',
-      '--directory',
-      Var('dart_root') + '/tools/testing/bin',
-    ],
-  },
-  {
     'name': 'd8_testing_binaries',
     'pattern': '.',
     'action': [
       'download_from_google_storage',
       '--no_auth',
       '--no_resume',
       '--bucket',
       'dart-dependencies',
       '--recursive',
       '--directory',
@@ skipping 114 matching lines @@
       "--no_resume",
       "--bucket",
       "dart-dependencies",
       "--platform=linux*",
       "--extract",
       "-s",
       Var('dart_root') + "/third_party/clang.tar.gz.sha1",
     ],
   },
 ]