Revert of ozone: gpu: Add plumbing for platform-specific gpu messaging

ui/ozone/gpu/gpu_platform_support_host.cc

-// 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.
-
-#include "ui/ozone/gpu/gpu_platform_support_host.h"
-
-#include "base/debug/trace_event.h"
-#include "base/logging.h"
-#include "ui/ozone/ozone_export.h"
-
-namespace ui {
-
-namespace {
-
-// No-op implementations of GpuPlatformSupportHost.
-class OZONE_EXPORT StubGpuPlatformSupportHost : public GpuPlatformSupportHost {
- public:
-  // GpuPlatformSupportHost:
-  virtual void OnChannelEstablished(int host_id, IPC::Sender* sender) OVERRIDE {
-  }
-  virtual void OnChannelDestroyed(int host_id) OVERRIDE {}
-  virtual bool OnMessageReceived(const IPC::Message&) OVERRIDE { return false; }
-};
-
-}  // namespace
-
-GpuPlatformSupportHost::GpuPlatformSupportHost() {
-}
-
-GpuPlatformSupportHost::~GpuPlatformSupportHost() {
-}
-
-GpuPlatformSupportHost* CreateStubGpuPlatformSupportHost() {
-  return new StubGpuPlatformSupportHost;
-}
-
-}  // namespace ui