Switch gyp_chromium from third_party/python_26, which is gone, to

build/gyp_chromium

 #!/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.
 
 # This script is wrapper for Chromium that adds some support for how GYP
 # is invoked by Chromium beyond what can be done in the gclient hooks.
 
 import glob
@@ skipping 286 matching lines @@
 
   # Use the Psyco JIT if available.
   if psyco:
     psyco.profile()
     print "Enabled Psyco JIT."
 
   # Fall back on hermetic python if we happen to get run under cygwin.
   # TODO(bradnelson): take this out once this issue is fixed:
   #    http://code.google.com/p/gyp/issues/detail?id=177
   if sys.platform == 'cygwin':
-    python_dir = os.path.join(chrome_src, 'third_party', 'python_26')
+    depot_tools_path = find_depot_tools.add_depot_tools_to_path()
+    python_dir = sorted(glob.glob(os.path.join(depot_tools_path,
+                                               'python2*_bin')))[-1]
     env = os.environ.copy()
     env['PATH'] = python_dir + os.pathsep + env.get('PATH', '')
     p = subprocess.Popen(
        [os.path.join(python_dir, 'python.exe')] + sys.argv,
        env=env, shell=False)
     p.communicate()
     sys.exit(p.returncode)
 
   gyp_helper.apply_chromium_gyp_env()
 
@@ skipping 77 matching lines @@
   if not RunGN(supplemental_includes):
     sys.exit(1)
   args.extend(
       ['-I' + i for i in additional_include_files(supplemental_includes, args)])
 
   print 'Updating projects from gyp files...'
   sys.stdout.flush()
 
   # Off we go...
   sys.exit(gyp.main(args))