Change the return type of WTF::bind() to |OwnPtr<Function>|

Source/web/WebEmbeddedWorkerImpl.cpp

Index: Source/web/WebEmbeddedWorkerImpl.cpp
diff --git a/Source/web/WebEmbeddedWorkerImpl.cpp b/Source/web/WebEmbeddedWorkerImpl.cpp
index 24a2327033df1285e3e2da989832efe0c811ef32..dce0093f37f4d53b1ad2e563169146251ea01120 100644
--- a/Source/web/WebEmbeddedWorkerImpl.cpp
+++ b/Source/web/WebEmbeddedWorkerImpl.cpp
@@ -79,7 +79,7 @@ public:
         m_scriptLoader->setClient(0);
     }
 
-    void load(ExecutionContext* loadingContext, const KURL& scriptURL, const Closure& callback)
+    void load(ExecutionContext* loadingContext, const KURL& scriptURL, PassOwnPtr<Closure> callback)
     {
         ASSERT(loadingContext);
         m_callback = callback;
@@ -90,7 +90,7 @@ public:
 
     virtual void notifyFinished() override
     {
-        m_callback();
+        (*m_callback)();
     }
 
     void cancel()
@@ -108,7 +108,7 @@ private:
     }
 
     RefPtr<WorkerScriptLoader> m_scriptLoader;
-    Closure m_callback;
+    OwnPtr<Closure> m_callback;
 };
 
 class WebEmbeddedWorkerImpl::LoaderProxy : public WorkerLoaderProxy {