Remove isUnclippedDescendant.

Source/core/rendering/compositing/CompositingInputsUpdater.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/rendering/compositing/CompositingInputsUpdater.h"
 
 #include "core/rendering/RenderBlock.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/compositing/CompositedLayerMapping.h"
@@ skipping 121 matching lines @@
 
             if (info.lastScrollingAncestor) {
                 const RenderObject* containingBlock = layer->renderer()->containingBlock();
                 const RenderLayer* parentLayerOnContainingBlockChain = findParentLayerOnContainingBlockChain(containingBlock);
 
                 properties.ancestorScrollingLayer = parentLayerOnContainingBlockChain->ancestorScrollingLayer();
                 if (parentLayerOnContainingBlockChain->scrollsOverflow())
                     properties.ancestorScrollingLayer = parentLayerOnContainingBlockChain;
 
                 if (layer->renderer()->isOutOfFlowPositioned() && !layer->subtreeIsInvisible()) {
-                    const RenderObject* lastScroller = info.lastScrollingAncestor->renderer();
                     const RenderLayer* clippingLayer = properties.clippingContainer ? properties.clippingContainer->enclosingLayer() : layer->compositor()->rootRenderLayer();
-                    properties.isUnclippedDescendant = lastScroller != containingBlock && lastScroller->isDescendantOf(containingBlock);
                     if (hasClippedStackingAncestor(layer, clippingLayer))
                         properties.clipParent = clippingLayer;
                 }
 
                 if (!layer->stackingNode()->isNormalFlowOnly()
                     && properties.ancestorScrollingLayer
                     && !info.ancestorStackingContext->renderer()->isDescendantOf(properties.ancestorScrollingLayer->renderer()))
                     properties.scrollParent = properties.ancestorScrollingLayer;
             }
         }
@@ skipping 35 matching lines @@
     ASSERT(!layer->childNeedsCompositingInputsUpdate());
     ASSERT(!layer->needsCompositingInputsUpdate());
 
     for (RenderLayer* child = layer->firstChild(); child; child = child->nextSibling())
         assertNeedsCompositingInputsUpdateBitsCleared(child);
 }
 
 #endif
 
 } // namespace blink