Call scoped_refptr<T>::get() rather than relying on implicit "operator T*"

cc/resources/raster_worker_pool.h

 // 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.
 
 #ifndef CC_RESOURCES_RASTER_WORKER_POOL_H_
 #define CC_RESOURCES_RASTER_WORKER_POOL_H_
 
 #include <vector>
 
 #include "base/hash_tables.h"
@@ skipping 119 matching lines @@
 
     RasterTask();
     RasterTask(PicturePileImpl* picture_pile,
                const Resource* resource,
                const Callback& callback,
                const Reply& reply,
                Task::Set* dependencies);
     ~RasterTask();
 
     // Returns true if Task is null (doesn't refer to anything).
-    bool is_null() const { return !internal_; }
+    bool is_null() const { return !internal_.get(); }
 
     // Returns the Task into an uninitialized state.
     void Reset();
 
    protected:
     friend class PixelBufferRasterWorkerPool;
     friend class RasterWorkerPool;
 
     scoped_refptr<internal::RasterWorkerPoolTask> internal_;
   };
@@ skipping 45 matching lines @@
   }
 
  private:
   ResourceProvider* resource_provider_;
   RasterTask::Queue::TaskVector raster_tasks_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RASTER_WORKER_POOL_H_