Remove implicit conversions from scoped_refptr to T* in gpu/

gpu/command_buffer/service/command_buffer_service.cc

Index: gpu/command_buffer/service/command_buffer_service.cc
diff --git a/gpu/command_buffer/service/command_buffer_service.cc b/gpu/command_buffer/service/command_buffer_service.cc
index c9c07822e8168ad4f49625e5b76acbd70cc47370..2c732c6735339d7762bff6ad4b2166c1ad6f901f 100644
--- a/gpu/command_buffer/service/command_buffer_service.cc
+++ b/gpu/command_buffer/service/command_buffer_service.cc
@@ -88,7 +88,7 @@ void CommandBufferService::SetGetBuffer(int32 transfer_buffer_id) {
   // This means ring_buffer_ can be NULL.
   ring_buffer_ = GetTransferBuffer(transfer_buffer_id);
   ring_buffer_id_ = transfer_buffer_id;
-  int32 size = ring_buffer_ ? ring_buffer_->size() : 0;
+  int32 size = ring_buffer_.get() ? ring_buffer_->size() : 0;
   num_entries_ = size / sizeof(CommandBufferEntry);
   put_offset_ = 0;
   SetGetOffset(0);