Remove assumption that null containerForRepaint assumes RenderView

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 662 matching lines @@
 
 bool FrameView::hasCompositedContent() const
 {
     if (RenderView* renderView = this->renderView())
         return renderView->compositor()->staleInCompositingMode();
     return false;
 }
 
 bool FrameView::isEnclosedInCompositingLayer() const
 {
+    // FIXME: It's a bug that compositing state isn't always up to date when this is called. crbug.com/366314
+    DisableCompositingQueryAsserts disabler;
+
     RenderObject* frameOwnerRenderer = m_frame->ownerRenderer();
-    if (frameOwnerRenderer && frameOwnerRenderer->containerForRepaint())
+    if (frameOwnerRenderer && frameOwnerRenderer->enclosingLayer()->enclosingCompositingLayerForRepaint())
         return true;
 
     if (FrameView* parentView = parentFrameView())
         return parentView->isEnclosedInCompositingLayer();
 
     return false;
 }
 
 RenderObject* FrameView::layoutRoot(bool onlyDuringLayout) const
 {
@@ skipping 2521 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