Update gtest to 786564fa4a3c, switch to googlemock in gtest

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 97 matching lines @@
   'src/breakpad/src':
    Var('chromium_git') + '/breakpad/breakpad/src.git' + '@' + '615a6b0e2b376e3ae946972a52ef897bf6daaff3',
 
   'src/buildtools':
    Var('chromium_git') + '/chromium/buildtools.git' + '@' +  Var('buildtools_revision'),
 
   'src/sdch/open-vcdiff':
    Var('chromium_git') + '/external/github.com/google/open-vcdiff.git' + '@' + '21d7d0b9c3d0c3ccbdb221c85ae889373f0a2a58',
 
   'src/testing/gtest':
-   Var('chromium_git') + '/external/github.com/google/googletest.git' + '@' + '6f8a66431cb592dad629028a50b3dd418a408c87',
-
-  'src/testing/gmock':
-   Var('chromium_git') + '/external/googlemock.git' + '@' + '0421b6f358139f02e102c9c332ce19a33faf75be', # from svn revision 566
+   Var('chromium_git') + '/external/github.com/google/googletest.git' + '@' + '786564fa4a3c8e0f908acca32cce481de5481b9f',
 
   'src/third_party/angle':
    Var('chromium_git') + '/angle/angle.git' + '@' +  Var('angle_revision'),
 
   'src/third_party/colorama/src':
    Var('chromium_git') + '/external/colorama.git' + '@' + '799604a1041e9b3bc5d2789ecbd7e8db2e18e6b8',
 
   'src/third_party/crashpad/crashpad':
    Var('chromium_git') + '/crashpad/crashpad.git' + '@' + '97b0f86d0ccb095391ca64b3948f0d6c02975ac1',
 
@@ skipping 678 matching lines @@
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     'name': 'gyp',
     'pattern': '.',
     'action': ['python', 'src/build/gyp_chromium'],
   },
 ]