Revert of win 2015: Update the toolchain package to VS2015 RTM.

build/vs_toolchain.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import json
 import os
 import pipes
 import shutil
 import subprocess
 import sys
@@ skipping 168 matching lines @@
   _CopyRuntime2013(
       target_dir, runtime_dir, 'msvc%s' + _VersionNumber() + '.dll')
   if configuration == 'Debug':
     _CopyRuntime2013(
         target_dir, runtime_dir, 'msvc%s' + _VersionNumber() + 'd.dll')
 
 
 def _GetDesiredVsToolchainHashes():
   """Load a list of SHA1s corresponding to the toolchains that we want installed
   to build with."""
+  # TODO(scottmg): If explicitly set to VS2015 override hashes to the VS2015 RC
+  # toolchain. http://crbug.com/492774.
   if os.environ.get('GYP_MSVS_VERSION') == '2015':
-    return ['49ae4b60d898182fc3f521c2fcda82c453915011']
+    return ['40721575c85171cea5d7afe5ec17bd108a94796e']
   else:
     # Default to VS2013.
     return ['ee7d718ec60c2dc5d255bbe325909c2021a7efef']
 
 
 def Update():
   """Requests an update of the toolchain to the specific hashes we have at
   this revision. The update outputs a .json of the various configuration
   information required to pass to gyp which we use in |GetToolchainDir()|.
   """
@@ skipping 47 matching lines @@
       'copy_dlls': CopyDlls,
   }
   if len(sys.argv) < 2 or sys.argv[1] not in commands:
     print >>sys.stderr, 'Expected one of: %s' % ', '.join(commands)
     return 1
   return commands[sys.argv[1]](*sys.argv[2:])
 
 
 if __name__ == '__main__':
   sys.exit(main())