Remove DisableCompositingQueryAsserts in FV::scrollbarExistenceDidChange

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 1750 matching lines @@
     // Note that simply having overlay scrollbars is not sufficient to be
     // certain that scrollbars' presence does not impact layout. This should
     // also check if custom scrollbars (as reported by shouldUseCustomScrollbars)
     // are in use as well.
     // http://crbug.com/269692
     bool useOverlayScrollbars = ScrollbarTheme::theme()->usesOverlayScrollbars();
 
     if (!useOverlayScrollbars && needsLayout())
         layout();
 
-    // FIXME: Rather than updating this state synchronously, we should set some dirty bits
-    // and clean them out when updating compositing.
-    // https://code.google.com/p/chromium/issues/detail?id=343756
-    DisableCompositingQueryAsserts disabler;
     if (renderView() && renderView()->usesCompositing()) {
         renderView()->compositor()->frameViewScrollbarsExistenceDidChange();
 
         if (!useOverlayScrollbars)
             renderView()->compositor()->frameViewDidChangeSize();
     }
 }
 
 void FrameView::handleLoadCompleted()
 {
@@ skipping 1434 matching lines @@
 void FrameView::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
 {
     ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
     if (AXObjectCache* cache = axObjectCache()) {
         cache->remove(scrollbar);
         cache->handleScrollbarUpdate(this);
     }
 }
 
 } // namespace WebCore