Revert of Extract WebGraphicsContext3DImpl from webkit/common/gpu.

gpu/blink/gpu_blink.gyp

-# Copyright 2014 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.
-
-{
-  'variables': {
-    'chromium_code': 1,
-  },
-  'targets': [
-    {
-      # GN version: //gpu/blink
-      'target_name': 'gpu_blink',
-      'type': '<(component)',
-      'dependencies': [
-        '../../base/base.gyp:base',
-        '../../gpu/command_buffer/command_buffer.gyp:gles2_utils',
-        '../../gpu/gpu.gyp:command_buffer_common',
-        '../../gpu/gpu.gyp:gles2_c_lib',
-        '../../gpu/gpu.gyp:gles2_implementation',
-        '../../gpu/skia_bindings/skia_bindings.gyp:gpu_skia_bindings',
-        '../../third_party/WebKit/public/blink.gyp:blink_minimal',
-      ],
-      'defines': [
-        'GPU_BLINK_IMPLEMENTATION',
-      ],
-      # This sources list is duplicated in //gpu/blink/BUILD.gn
-      'sources': [
-        'gpu_blink_export.h',
-        'webgraphicscontext3d_impl.cc',
-        'webgraphicscontext3d_impl.h',
-      ],
-      # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-      'msvs_disabled_warnings': [ 4267, ],
-    },
-  ]
-}