Let the WebMediaPlayer decide whether to use overlay video.

Source/core/layout/compositing/DeprecatedPaintLayerCompositor.h

 /*
  * Copyright (C) 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 192 matching lines @@
 
     GraphicsLayerFactory* graphicsLayerFactory() const;
     ScrollingCoordinator* scrollingCoordinator() const;
 
     void enableCompositingModeIfNeeded();
 
     bool requiresHorizontalScrollbarLayer() const;
     bool requiresVerticalScrollbarLayer() const;
     bool requiresScrollCornerLayer() const;
 
-    void applyOverlayFullscreenVideoAdjustment();
+    void applyOverlayFullscreenVideoAdjustmentIfNeeded();
 
     LayoutView& m_layoutView;
     OwnPtr<GraphicsLayer> m_rootContentLayer;
     OwnPtr<GraphicsLayer> m_rootTransformLayer;
 
     CompositingReasonFinder m_compositingReasonFinder;
 
     CompositingUpdateType m_pendingUpdateType;
 
     bool m_hasAcceleratedCompositing;
@@ skipping 23 matching lines @@
 
     // Layers for overflow controls
     OwnPtr<GraphicsLayer> m_layerForHorizontalScrollbar;
     OwnPtr<GraphicsLayer> m_layerForVerticalScrollbar;
     OwnPtr<GraphicsLayer> m_layerForScrollCorner;
 };
 
 } // namespace blink
 
 #endif // DeprecatedPaintLayerCompositor_h