Get rid of CompositingState.

sky/engine/core/rendering/RenderLayerScrollableArea.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 235 matching lines @@
     }
 
     // The caret rect needs to be invalidated after scrolling
     frame->selection().setCaretRectNeedsUpdate();
 
     FloatQuad quadForFakeMouseMoveEvent = FloatQuad(layer()->renderer()->previousPaintInvalidationRect());
 
     quadForFakeMouseMoveEvent = paintInvalidationContainer->localToAbsoluteQuad(quadForFakeMouseMoveEvent);
     frame->eventHandler().dispatchFakeMouseMoveEventSoonInQuad(quadForFakeMouseMoveEvent);
 
-    // For querying RenderLayer::compositingState()
-    // This code appears correct, since scrolling outside of layout happens during activities that do not dirty compositing state.
-    DisableCompositingQueryAsserts disabler;
     if (box().frameView()->isInPerformLayout())
         box().setShouldDoFullPaintInvalidation(true);
     else
         box().invalidatePaintUsingContainer(paintInvalidationContainer, layer()->renderer()->previousPaintInvalidationRect(), InvalidationScroll);
 
     // Schedule the scroll DOM event.
     if (box().node())
         box().node()->document().enqueueScrollEventForNode(box().node());
 }
 
@@ skipping 546 matching lines @@
 void RenderLayerScrollableArea::setTopmostScrollChild(RenderLayer* scrollChild)
 {
     // We only want to track the topmost scroll child for scrollable areas with
     // overlay scrollbars.
     if (!hasOverlayScrollbars())
         return;
     m_nextTopmostScrollChild = scrollChild;
 }
 
 } // namespace blink