Remove implicit conversions from scoped_refptr to T* in gpu/

gpu/command_buffer/client/transfer_buffer.cc

Index: gpu/command_buffer/client/transfer_buffer.cc
diff --git a/gpu/command_buffer/client/transfer_buffer.cc b/gpu/command_buffer/client/transfer_buffer.cc
index c5ce3d549bd0ef5fcfb3d05fec095919559feeb0..da00d87d17e5cdad45c6493701e01db5268499b6 100644
--- a/gpu/command_buffer/client/transfer_buffer.cc
+++ b/gpu/command_buffer/client/transfer_buffer.cc
@@ -65,7 +65,7 @@ void TransferBuffer::Free() {
 }
 
 bool TransferBuffer::HaveBuffer() const {
-  DCHECK(buffer_id_ == -1 || buffer_);
+  DCHECK(buffer_id_ == -1 || buffer_.get());
   return buffer_id_ != -1;
 }
 
@@ -87,7 +87,7 @@ void TransferBuffer::AllocateRingBuffer(unsigned int size) {
     scoped_refptr<gpu::Buffer> buffer =
         helper_->command_buffer()->CreateTransferBuffer(size, &id);
     if (id != -1) {
-      DCHECK(buffer);
+      DCHECK(buffer.get());
       buffer_ = buffer;
       ring_buffer_.reset(new RingBuffer(
           alignment_,