[Coverity] Pass-by-val -> pass-by-ref

chrome/browser/extensions/web_intent_callbacks.h

Index: chrome/browser/extensions/web_intent_callbacks.h
diff --git a/chrome/browser/extensions/web_intent_callbacks.h b/chrome/browser/extensions/web_intent_callbacks.h
index 600af43f572ad5974ecb87559bcc58782138da10..067d825d5a27cf442905e4a5f2aeda83bdd66575 100644
--- a/chrome/browser/extensions/web_intent_callbacks.h
+++ b/chrome/browser/extensions/web_intent_callbacks.h
@@ -68,7 +68,7 @@ class WebIntentCallbacks : public ProfileKeyedService {
   // Private method to get and clear the dispatcher for the given string key.
   // If there is no dispatcher available, this will return NULL. Otherwise, this
   // transfers ownership of the WebIntentsDispatcher to the caller.
-  content::WebIntentsDispatcher* GetAndClear(std::string key);
+  content::WebIntentsDispatcher* GetAndClear(const std::string& key);
 
   class SourceObserver;