Remove the default format from ResourcePool.

cc/test/fake_tile_manager.cc

 // Copyright 2012 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/test/fake_tile_manager.h"
 
 #include <deque>
 #include <limits>
 
 #include "base/lazy_instance.h"
@@ skipping 28 matching lines @@
       RasterTask* task = it->get();
 
       task->WillComplete();
       task->CompleteOnOriginThread(this);
       task->DidComplete();
 
       task->RunReplyOnOriginThread();
     }
     completed_tasks_.clear();
   }
+  ResourceFormat GetResourceFormat() override { return RGBA_8888; }
 
   // Overridden from TileTaskClient:
   scoped_ptr<RasterBuffer> AcquireBufferForRaster(
       const Resource* resource) override {
     return nullptr;
   }
   void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override {}
 
  private:
   RasterTask::Vector completed_tasks_;
@@ skipping 31 matching lines @@
 }
 
 void FakeTileManager::Release(Tile* tile) {
   TileManager::Release(tile);
 
   FreeResourcesForReleasedTiles();
   CleanUpReleasedTiles();
 }
 
 }  // namespace cc