Switch V8 to new mirror.

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of 'src').
 #
@@ skipping 140 matching lines @@
   'src/tools/grit':
     Var('chromium_git') + '/external/grit-i18n.git' + '@' + '740badd5e3e44434a9a47b5d16749daac1e8ea80', # from svn revision 176
 
   'src/tools/gyp':
     Var('chromium_git') + '/external/gyp.git' + '@' + '46282cedf40ff7fe803be4af357b9d59050f02e4', # from svn revision 1977
 
   'src/tools/swarming_client':
    Var('chromium_git') + '/external/swarming.client.git' + '@' +  Var('swarming_revision'),
 
   'src/v8':
-    Var('chromium_git') + '/external/v8.git' + '@' +  Var('v8_revision'),
+    Var('chromium_git') + '/v8/v8.git' + '@' +  Var('v8_revision'),
 
   'src/native_client':
    Var('chromium_git') + '/native_client/src/native_client.git' + '@' + Var('nacl_revision'),
 
   'src/chrome/test/data/extensions/api_test/permissions/nacl_enabled/bin':
    Var('chromium_git') + '/native_client/src/native_client/tests/prebuilt.git' + '@' + '3e17365176c94624f46cace174f61834b7f3c35d',
 
   'src/third_party/sfntly/cpp/src':
     Var('chromium_git') + '/external/sfntly/cpp/src.git' + '@' +  Var('sfntly_revision'),
 
@@ skipping 621 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',
     ],
   },
 ]