Prepare for move-only PassOwnPtr in the remaining directories.

third_party/WebKit/Source/wtf/Functional.h

Index: third_party/WebKit/Source/wtf/Functional.h
diff --git a/third_party/WebKit/Source/wtf/Functional.h b/third_party/WebKit/Source/wtf/Functional.h
index c19da9241f3bc2e1106c4728c21d022276d3eb30..8aa0a938b4c89222d325713df99b65a03465ee2b 100644
--- a/third_party/WebKit/Source/wtf/Functional.h
+++ b/third_party/WebKit/Source/wtf/Functional.h
@@ -159,7 +159,7 @@ public:
     }
 
     template <typename... IncomingParameters>
-    R operator()(PassOwnPtr<C> c, IncomingParameters&&... parameters)
+    R operator()(const PassOwnPtr<C>& c, IncomingParameters&&... parameters)
     {
         return (c.get()->*m_function)(std::forward<IncomingParameters>(parameters)...);
     }