Roll gyp to 4a9b712d5cb4a5ba7a9950128a7219569caf7263.

DEPS

 # This file is used to manage the dependencies of the Chromium src repo. It is
 # used by gclient to determine what version of each dependency to check out, and
 # where.
 #
 # For more information, please refer to the official documentation:
 #   https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code
 #
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 #
@@ skipping 144 matching lines @@
   'src/third_party/leveldatabase/src':
     Var('chromium_git') + '/external/leveldb.git' + '@' + '251ebf5dc70129ad3c38193fe6c99a5b0ec6b9fa',
 
   'src/third_party/snappy/src':
     Var('chromium_git') + '/external/snappy.git' + '@' + '762bb32f0c9d2f31ba4958c7c0933d22e80c20bf',
 
   'src/tools/grit':
     Var('chromium_git') + '/external/grit-i18n.git' + '@' + 'a5890a8118c0c80cc0560e6d8d5cf65e5d725509', # from svn revision 185
 
   'src/tools/gyp':
-    Var('chromium_git') + '/external/gyp.git' + '@' + '34640080d08ab2a37665512e52142947def3056d', # from svn revision 2034
+    Var('chromium_git') + '/external/gyp.git' + '@' + '4a9b712d5cb4a5ba7a9950128a7219569caf7263',
 
   'src/tools/swarming_client':
    Var('chromium_git') + '/external/swarming.client.git' + '@' +  Var('swarming_revision'),
 
   'src/v8':
     Var('chromium_git') + '/v8/v8.git' + '@' +  Var('v8_revision'),
 
   'src/native_client':
    Var('chromium_git') + '/native_client/src/native_client.git' + '@' + Var('nacl_revision'),
 
@@ skipping 599 matching lines @@
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]