Make NavigationScheduler post loading tasks instead of timers

Source/core/loader/NavigationScheduler.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Adam Barth. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef NavigationScheduler_h
 #define NavigationScheduler_h
 
 #include "core/CoreExport.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
+#include "platform/scheduler/CancellableTaskFactory.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
@@ skipping 59 matching lines @@
 private:
     friend class FrameNavigationDisabler;
 
     void disableFrameNavigation() { ++m_navigationDisableCount; }
     void enableFrameNavigation() { --m_navigationDisableCount; }
     bool isFrameNavigationAllowed() const { return !m_navigationDisableCount; }
 
     bool shouldScheduleReload() const;
     bool shouldScheduleNavigation(const String& url) const;
 
-    void timerFired(Timer<NavigationScheduler>*);
+    void navigateTask();
     void schedule(PassOwnPtrWillBeRawPtr<ScheduledNavigation>);
 
     static bool mustReplaceCurrentItem(LocalFrame* targetFrame);
 
     RawPtrWillBeMember<LocalFrame> m_frame;
-    Timer<NavigationScheduler> m_timer;
+    CancellableTaskFactory m_navigateTaskFactory;
     OwnPtrWillBeMember<ScheduledNavigation> m_redirect;
     int m_navigationDisableCount;
 };
 
 } // namespace blink
 
 #endif // NavigationScheduler_h