Remove the default format from ResourcePool.

cc/resources/bitmap_tile_task_worker_pool.h

 // 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.
 
 #ifndef CC_RESOURCES_BITMAP_TILE_TASK_WORKER_POOL_H_
 #define CC_RESOURCES_BITMAP_TILE_TASK_WORKER_POOL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "cc/resources/tile_task_runner.h"
@@ skipping 14 matching lines @@
  public:
   ~BitmapTileTaskWorkerPool() override;
 
   static scoped_ptr<TileTaskWorkerPool> Create(
       base::SequencedTaskRunner* task_runner,
       TaskGraphRunner* task_graph_runner,
       ResourceProvider* resource_provider);
 
   // Overridden from TileTaskWorkerPool:
   TileTaskRunner* AsTileTaskRunner() override;
+  ResourceFormat GetResourceFormat() override;
 
   // Overridden from TileTaskRunner:
   void SetClient(TileTaskRunnerClient* client) override;
   void Shutdown() override;
   void ScheduleTasks(TileTaskQueue* queue) override;
   void CheckForCompletedTasks() override;
 
   // Overridden from TileTaskClient:
   scoped_ptr<RasterBuffer> AcquireBufferForRaster(
       const Resource* resource) override;
@@ skipping 25 matching lines @@
 
   base::WeakPtrFactory<BitmapTileTaskWorkerPool>
       task_set_finished_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BitmapTileTaskWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_BITMAP_TILE_TASK_WORKER_POOL_H_