Revert of Extract WebGraphicsContext3DImpl from webkit/common/gpu.

gpu/blink/BUILD.gn

-# 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.
-
-# GYP version: //gpu/blink/gpu_blink.gyp:gpu_blink
-component("blink") {
-  output_name = "gpu_blink"
-
-  sources = [
-    "gpu_blink_export.h",
-    "webgraphicscontext3d_impl.cc",
-    "webgraphicscontext3d_impl.h",
-  ]
-
-  defines = [ "GPU_BLINK_IMPLEMENTATION" ]
-
-  deps = [
-    "//base",
-    "//gpu",
-    "//gpu/command_buffer/client:gles2_c_lib",
-    "//gpu/command_buffer/client:gles2_implementation",
-    "//gpu/skia_bindings",
-    "//skia",
-    "//third_party/WebKit/public:blink_minimal",
-  ]
-
-  if (is_win) {
-    cflags = [ "/wd4267" ]  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-  }
-}