Get rid of background-clip:text and PaintBehaviorForceBlackText.

sky/engine/core/rendering/RenderLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 1118 matching lines @@
     }
 
     // If this layer's renderer is a child of the paintingRoot, we render unconditionally, which
     // is done by passing a nil paintingRoot down to our renderer (as if no paintingRoot was ever set).
     // Else, our renderer tree may or may not contain the painting root, so we pass that root along
     // so it will be tested against as we descend through the renderers.
     RenderObject* paintingRootForRenderer = 0;
     if (localPaintingInfo.paintingRoot && !renderer()->isDescendantOf(localPaintingInfo.paintingRoot))
         paintingRootForRenderer = localPaintingInfo.paintingRoot;
 
-    ASSERT(!(localPaintingInfo.paintBehavior & PaintBehaviorForceBlackText));
-
     bool shouldPaintBackground = isPaintingCompositedBackground && shouldPaintContent;
     bool shouldPaintNegZOrderList = !isPaintingScrollingContent && isPaintingCompositedBackground;
     bool shouldPaintOwnContents = isPaintingCompositedForeground && shouldPaintContent;
     bool shouldPaintNormalFlowAndPosZOrderLists = isPaintingCompositedForeground;
     bool shouldPaintOverlayScrollbars = isPaintingOverlayScrollbars;
     bool shouldPaintMask = (paintFlags & PaintLayerPaintingCompositingMaskPhase) && shouldPaintContent && renderer()->hasMask();
 
     // FIXME(sky): Get rid of PaintBehavior argument now that it's always Normal.
     PaintBehavior paintBehavior = PaintBehaviorNormal;
 
@@ skipping 1037 matching lines @@
     }
 }
 
 void showLayerTree(const blink::RenderObject* renderer)
 {
     if (!renderer)
         return;
     showLayerTree(renderer->enclosingLayer());
 }
 #endif