Use WeakPtr for posting cc tasks to main thread

cc/thread_proxy.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_THREAD_PROXY_H_
 #define CC_THREAD_PROXY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time.h"
@@ skipping 134 matching lines @@
     RendererCapabilities m_RendererCapabilitiesMainThreadCopy;
     bool m_started;
     bool m_texturesAcquired;
     bool m_inCompositeAndReadback;
     bool m_manageTilesPending;
     // Weak pointer to use when posting tasks to the impl thread.
     base::WeakPtr<ThreadProxy> m_implThreadWeakPtr;
 
     base::WeakPtrFactory<ThreadProxy> m_weakFactoryOnImplThread;
 
+    base::WeakPtr<ThreadProxy> m_mainThreadWeakPtr;
+    base::WeakPtrFactory<ThreadProxy> m_weakFactory;
+
     scoped_ptr<LayerTreeHostImpl> m_layerTreeHostImpl;
 
     scoped_ptr<InputHandler> m_inputHandlerOnImplThread;
 
     scoped_ptr<Scheduler> m_schedulerOnImplThread;
 
-    scoped_refptr<ScopedThreadProxy> m_mainThreadProxy;
-
     // Holds on to the context we might use for compositing in between initializeContext()
     // and initializeRenderer() calls.
     scoped_ptr<OutputSurface> m_outputSurfaceBeforeInitializationOnImplThread;
 
     // Set when the main thread is waiting on a scheduledActionBeginFrame to be issued.
     CompletionEvent* m_beginFrameCompletionEventOnImplThread;
 
     // Set when the main thread is waiting on a readback.
     ReadbackRequest* m_readbackRequestOnImplThread;
 
@@ skipping 13 matching lines @@
     base::TimeDelta m_totalCommitTime;
     size_t m_totalCommitCount;
 
     bool m_deferCommits;
     scoped_ptr<BeginFrameAndCommitState> m_pendingDeferredCommit;
 };
 
 }  // namespace cc
 
 #endif  // CC_THREAD_PROXY_H_