Remove the default format from ResourcePool.

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