Don't destroy RenderWidgetCompositor during DoDeferredClose

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index ff7325c4291032cbd263309fa278ed7d3e1f060d..474dbd67d1f4b56c819ece89790fed4892302833 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -73,6 +73,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
     bool manage_tiles_pending;
     bool can_cancel_commit;
     bool defer_commits;
+    bool host_client_finished_;
 
     RendererCapabilities renderer_capabilities_main_thread_copy;
 
@@ -153,6 +154,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
   virtual void FinishAllRendering() OVERRIDE;
   virtual bool IsStarted() const OVERRIDE;
   virtual void SetLayerTreeHostClientReady() OVERRIDE;
+  virtual void SetLayerTreeHostClientFinished() OVERRIDE;
   virtual void SetVisible(bool visible) OVERRIDE;
   virtual const RendererCapabilities& GetRendererCapabilities() const OVERRIDE;
   virtual void SetNeedsAnimate() OVERRIDE;