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

ppapi/ppapi_proxy.gypi

-# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Copyright (c) 2012 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': 'ppapi_proxy',
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
         '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
+        '../gpu/gpu.gyp:gles2_implementation',
         '../gpu/gpu.gyp:gpu_ipc',
         '../ipc/ipc.gyp:ipc',
         '../skia/skia.gyp:skia',
         '../ui/gfx/surface/surface.gyp:surface',
         'ppapi.gyp:ppapi_c',
         'ppapi_shared',
       ],
       'all_dependent_settings': {
         'include_dirs': [
            '..',
@@ skipping 126 matching lines @@
         'proxy/serialized_var.cc',
         'proxy/serialized_var.h',
         'proxy/var_serialization_rules.h',
       ],
       'defines': [
         'PPAPI_PROXY_IMPLEMENTATION',
       ],
     },
   ],
 }