cc: Remove all traces of synchronous GPU rasterization

cc/resources/software_rasterizer.cc

-// Copyright 2015 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 "cc/resources/software_rasterizer.h"
-
-namespace cc {
-
-scoped_ptr<SoftwareRasterizer> SoftwareRasterizer::Create() {
-  return make_scoped_ptr<SoftwareRasterizer>(new SoftwareRasterizer());
-}
-
-SoftwareRasterizer::SoftwareRasterizer() {
-}
-
-SoftwareRasterizer::~SoftwareRasterizer() {
-}
-
-PrepareTilesMode SoftwareRasterizer::GetPrepareTilesMode() {
-  return PrepareTilesMode::RASTERIZE_PRIORITIZED_TILES;
-}
-
-void SoftwareRasterizer::RasterizeTiles(
-    const TileVector& tiles,
-    ResourcePool* resource_pool,
-    ResourceFormat resource_format,
-    const UpdateTileDrawInfoCallback& update_tile_draw_info) {
-}
-
-}  // namespace cc