Revert r118525 / Re-land r118240 - the build failure was a flake.

webkit/gpu/webkit_gpu.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'webkit_gpu',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
-        '<(DEPTH)/gpu/gpu.gyp:command_buffer_service',
-        '<(DEPTH)/gpu/gpu.gyp:command_buffer_client',
-        '<(DEPTH)/gpu/gpu.gyp:gles2_c_lib',
+        '<(DEPTH)/gpu/gpu.gyp:command_buffer_service',
+        '<(DEPTH)/gpu/gpu.gyp:command_buffer_client',
+        '<(DEPTH)/gpu/gpu.gyp:gles2_c_lib',
+        '<(DEPTH)/gpu/gpu.gyp:gles2_implementation',
         '<(DEPTH)/third_party/angle/src/build_angle.gyp:translator_glsl',
         '<(DEPTH)/ui/gfx/gl/gl.gyp:gl',
       ],
       'include_dirs': [
         '<(DEPTH)/skia/config',
       ],
       'sources': [
         # This list contains all .h and .cc in gpu except for test code.
         'webgraphicscontext3d_in_process_command_buffer_impl.cc',
         'webgraphicscontext3d_in_process_command_buffer_impl.h',
         'webgraphicscontext3d_in_process_impl.cc',
         'webgraphicscontext3d_in_process_impl.h',
         'webkit_gpu.gypi',
       ],
       'conditions': [
         ['inside_chromium_build==0', {
           'dependencies': [
             '<(DEPTH)/webkit/support/setup_third_party.gyp:third_party_headers',
           ],
         }],
       ],
     },
   ],
 }