Remove check_git_config.py DEPS hook.

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 793 matching lines @@
         'src/third_party/closure_compiler/build',
         'src/tools',
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     'name': 'gyp',
     'pattern': '.',
     'action': ['python', 'src/build/gyp_chromium'],
   },
-  {
-    # Verify committers' ~/.netc, gclient and git are properly configured for
-    # write access to the git repo. To be removed sometime after Chrome to git
-    # migration completes (let's say Sep 1 2014).
-    'name': 'check_git_config',
-    'pattern': '.',
-    'action': [
-        'python',
-        'src/tools/check_git_config.py',
-        '--running-as-hook',
-    ],
-  },
 ]