Bump DEPS and use new download_toolchains.py in NaCl Repo.

build/download_nacl_toolchains.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Shim to run nacl toolchain download script only if there is a nacl dir."""
 
 import os
 import sys
 
@@ skipping 32 matching lines @@
     if 'target_arch=arm' in os.environ.get('GYP_DEFINES', ''):
       use_pnacl = True
     buildbot_name = os.environ.get('BUILDBOT_BUILDERNAME', '')
     if buildbot_name.find('pnacl') >= 0 and  buildbot_name.find('sdk') >= 0:
       use_pnacl = True
     if use_pnacl:
       print '\n*** DOWNLOADING PNACL TOOLCHAIN ***\n'
     else:
       args.append('--no-pnacl')
 
-  download_toolchains.Main(args)
+  # Append the name of the file to use as a version and hash source.
+  # NOTE:  While not recommended, it is possible to redirect this file to
+  # a chrome location to avoid branching NaCl if just a toolchain needs
+  # to be bumped.
+  args.append(os.path.join(nacl_dir,'TOOL_REVISIONS'))
+
+  download_toolchains.main(args)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv[1:]))