Remove dead code related to compositing from Sky

sky/engine/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 166 matching lines @@
 void FrameView::recalcOverflowAfterStyleChange()
 {
     RenderView* renderView = this->renderView();
     RELEASE_ASSERT(renderView);
     if (!renderView->needsOverflowRecalcAfterStyleChange())
         return;
 
     renderView->recalcOverflowAfterStyleChange();
 }
 
-bool FrameView::isEnclosedInCompositingLayer() const
-{
-    return false;
-}
-
 RenderObject* FrameView::layoutRoot(bool onlyDuringLayout) const
 {
     return onlyDuringLayout && layoutPending() ? 0 : m_layoutSubtreeRoot;
 }
 
 void FrameView::performPreLayoutTasks()
 {
     TRACE_EVENT0("blink", "FrameView::performPreLayoutTasks");
     lifecycle().advanceTo(DocumentLifecycle::InPreLayout);
 
@@ skipping 645 matching lines @@
     totalObjects = 0;
 
     for (RenderObject* o = root; o; o = o->nextInPreOrder(root)) {
         ++totalObjects;
         if (o->needsLayout())
             ++needsLayoutObjects;
     }
 }
 
 } // namespace blink