gpu: Remove async texture uploads.

gpu/command_buffer/service/async_pixel_transfer_manager_mac.cc

-// Copyright 2013 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 "gpu/command_buffer/service/async_pixel_transfer_manager.h"
-
-#include "base/trace_event/trace_event.h"
-#include "gpu/command_buffer/service/async_pixel_transfer_manager_idle.h"
-#include "gpu/command_buffer/service/async_pixel_transfer_manager_stub.h"
-#include "ui/gl/gl_implementation.h"
-
-namespace gpu {
-
-AsyncPixelTransferManager* AsyncPixelTransferManager::Create(
-    gfx::GLContext* context) {
-  TRACE_EVENT0("gpu", "AsyncPixelTransferManager::Create");
-  switch (gfx::GetGLImplementation()) {
-    case gfx::kGLImplementationOSMesaGL:
-    case gfx::kGLImplementationDesktopGL:
-    case gfx::kGLImplementationDesktopGLCoreProfile:
-    case gfx::kGLImplementationAppleGL:
-      return new AsyncPixelTransferManagerIdle(true);
-    case gfx::kGLImplementationMockGL:
-      return new AsyncPixelTransferManagerStub;
-    default:
-      NOTREACHED();
-      return NULL;
-  }
-}
-
-}  // namespace gpu