Remove implicit conversions from scoped_refptr to T* in gpu/

gpu/command_buffer/service/async_pixel_transfer_delegate.cc

Index: gpu/command_buffer/service/async_pixel_transfer_delegate.cc
diff --git a/gpu/command_buffer/service/async_pixel_transfer_delegate.cc b/gpu/command_buffer/service/async_pixel_transfer_delegate.cc
index 6b1dbc6eb3babbd40bd630489f4dd72642d0f16f..201026b21769aa87f548fceeba749ec4ade44812 100644
--- a/gpu/command_buffer/service/async_pixel_transfer_delegate.cc
+++ b/gpu/command_buffer/service/async_pixel_transfer_delegate.cc
@@ -10,7 +10,7 @@ AsyncMemoryParams::AsyncMemoryParams(scoped_refptr<Buffer> buffer,
                     uint32 data_offset,
                     uint32 data_size)
     : buffer_(buffer), data_offset_(data_offset), data_size_(data_size) {
-  DCHECK(buffer_);
+  DCHECK(buffer_.get());
   DCHECK(buffer_->memory());
 }