Remove implicit conversions from scoped_refptr to T* in gpu/

gpu/command_buffer/client/mapped_memory.cc

 // Copyright (c) 2011 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 "gpu/command_buffer/client/mapped_memory.h"
 
 #include <algorithm>
 #include <functional>
 
 #include "base/debug/trace_event.h"
@@ skipping 73 matching lines @@
   // Make a new chunk to satisfy the request.
   CommandBuffer* cmd_buf = helper_->command_buffer();
   unsigned int chunk_size =
       ((size + chunk_size_multiple_ - 1) / chunk_size_multiple_) *
       chunk_size_multiple_;
   int32 id = -1;
   scoped_refptr<gpu::Buffer> shm =
       cmd_buf->CreateTransferBuffer(chunk_size, &id);
   if (id  < 0)
     return NULL;
-  DCHECK(shm);
+  DCHECK(shm.get());
   MemoryChunk* mc = new MemoryChunk(id, shm, helper_, poll_callback_);
   allocated_memory_ += mc->GetSize();
   chunks_.push_back(mc);
   void* mem = mc->Alloc(size);
   DCHECK(mem);
   *shm_id = mc->shm_id();
   *shm_offset = mc->GetOffset(mem);
   return mem;
 }
 
@@ skipping 29 matching lines @@
       cmd_buf->DestroyTransferBuffer(chunk->shm_id());
       allocated_memory_ -= chunk->GetSize();
       iter = chunks_.erase(iter);
     } else {
       ++iter;
     }
   }
 }
 
 }  // namespace gpu