Cleanup: return by const reference instead of value in BufferedResourceLoader

media/blink/buffered_resource_loader.h

Index: media/blink/buffered_resource_loader.h
diff --git a/media/blink/buffered_resource_loader.h b/media/blink/buffered_resource_loader.h
index f55569edcef61e94e8211b23da8395bed4b0f891..942949e6024d1c8345eb6c641721294ca5a4b837 100644
--- a/media/blink/buffered_resource_loader.h
+++ b/media/blink/buffered_resource_loader.h
@@ -208,7 +208,7 @@ class MEDIA_BLINK_EXPORT BufferedResourceLoader
   // Returns the original URL of the response. If the request is redirected to
   // another URL it is the URL after redirected. If the response is generated in
   // a Service Worker it is empty.
-  const GURL response_original_url() const { return response_original_url_; }
+  const GURL& response_original_url() const { return response_original_url_; }
 
   // Returns an estimate of the amount of memory owned by the resource loader.
   int64_t GetMemoryUsage() const;