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

Source/core/page/NetworkStateNotifierTest.cpp

 /*
  * Copyright (c) 2014, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 35 matching lines @@
         : m_observedType(blink::ConnectionTypeNone)
         , m_callbackCount(0)
     {
     }
 
     virtual void connectionTypeChange(blink::WebConnectionType type)
     {
         m_observedType = type;
         m_callbackCount += 1;
 
-        if (!m_closure.isNull())
-            m_closure();
+        if (m_closure && !m_closure->isNull())
+            (*m_closure)();
     }
 
     blink::WebConnectionType observedType() const
     {
         return m_observedType;
     }
 
     int callbackCount() const
     {
         return m_callbackCount;
     }
 
-    void setNotificationCallback(const Closure& closure)
+    void setNotificationCallback(PassOwnPtr<Closure> closure)
     {
         m_closure = closure;
     }
 
 private:
-    Closure m_closure;
+    OwnPtr<Closure> m_closure;
     blink::WebConnectionType m_observedType;
     int m_callbackCount;
 };
 
 class ExitTask
     : public blink::WebThread::Task {
 public:
     ExitTask(blink::WebThread* thread)
         : m_thread(thread)
     {
@@ skipping 184 matching lines @@
     m_notifier.addObserver(&observer2, executionContext2());
     m_notifier.removeObserver(&observer1, executionContext());
     m_notifier.removeObserver(&observer2, executionContext2());
 
     setType(blink::ConnectionTypeBluetooth);
     EXPECT_EQ(observer1.observedType(), blink::ConnectionTypeNone);
     EXPECT_EQ(observer2.observedType(), blink::ConnectionTypeNone);
 }
 
 } // namespace blink