Remove no-op did(De)activateCompositor calls

public/web/WebWidgetClient.h

 /*
  * Copyright (C) 2009 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 40 matching lines @@
     // Called when a region of the WebWidget needs to be re-painted.
     virtual void didInvalidateRect(const WebRect&) { }
 
     // Called when a region of the WebWidget, given by clipRect, should be
     // scrolled by the specified dx and dy amounts.
     virtual void didScrollRect(int dx, int dy, const WebRect& clipRect) { }
 
     // Called when the Widget has changed size as a result of an auto-resize.
     virtual void didAutoResize(const WebSize& newSize) { }
 
-    // Called when the compositor is enabled or disabled.
-    virtual void didActivateCompositor() { }
-    virtual void didDeactivateCompositor() { }
-
     // Attempt to initialize compositing for this widget. If this is successful,
     // layerTreeView() will return a valid WebLayerTreeView.
     virtual void initializeLayerTreeView() { }
 
     // Return a compositing view used for this widget. This is owned by the
     // WebWidgetClient.
     virtual WebLayerTreeView* layerTreeView() { return 0; }
     // FIXME: Remove all overrides of this and change layerTreeView() above to ASSERT_NOT_REACHED.
     virtual bool allowsBrokenNullLayerTreeView() const { return false; }
 
@@ skipping 106 matching lines @@
     // modified by script, not by user input.
     virtual void didUpdateTextOfFocusedElementByNonUserInput() { }
 
 protected:
     ~WebWidgetClient() { }
 };
 
 } // namespace blink
 
 #endif