Revert 114283 - Avoid using backing store for compositing layers that just need to clip

Source/WebCore/rendering/RenderLayer.h

 /*
  * Copyright (C) 2003, 2009 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 395 matching lines @@
 
     // Returns the nearest enclosing layer that is scrollable.
     RenderLayer* enclosingScrollableLayer() const;
 
     // The layer relative to which clipping rects for this layer are computed.
     RenderLayer* clippingRoot() const;
 
 #if USE(ACCELERATED_COMPOSITING)
     // Enclosing compositing layer; if includeSelf is true, may return this.
     RenderLayer* enclosingCompositingLayer(bool includeSelf = true) const;
-    RenderLayer* enclosingCompositingLayerForRepaint(bool includeSelf = true) const;
     // Ancestor compositing layer, excluding this.
     RenderLayer* ancestorCompositingLayer() const { return enclosingCompositingLayer(false); }
 #endif
 
 #if ENABLE(CSS_FILTERS)
     RenderLayer* enclosingFilterLayer(bool includeSelf = true) const;
     RenderLayer* enclosingFilterRepaintLayer() const;
     void setFilterBackendNeedsRepaintingInRect(const LayoutRect&, bool immediate);
 #endif
 
@@ skipping 519 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const WebCore::RenderLayer*);
 void showLayerTree(const WebCore::RenderObject*);
 #endif
 
 #endif // RenderLayer_h