Remove the straggling DisableCompositingQueryAsserts.

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 90 matching lines @@
 
 HostWindow* RenderLayerScrollableArea::hostWindow() const
 {
     if (Page* page = box().frame()->page())
         return &page->chrome();
     return nullptr;
 }
 
 void RenderLayerScrollableArea::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect)
 {
-    // See crbug.com/343132.
-    DisableCompositingQueryAsserts disabler;
-
     IntRect scrollRect = rect;
     // If we are not yet inserted into the tree, there is no need to issue paint invaldiations.
     if (!box().parent())
         return;
 
     if (scrollbar == m_vBar.get())
         scrollRect.move(verticalScrollbarStart(0, box().width()), box().borderTop());
     else
         scrollRect.move(horizontalScrollbarStart(0), box().height() - box().borderBottom() - scrollbar->height());
 
@@ skipping 640 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