Remove support for CompositingReasonPositionSticky

Source/core/rendering/compositing/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 448 matching lines @@
         if (ScrollingCoordinator* scrollingCoordinator = this->scrollingCoordinator())
             scrollingCoordinator->frameViewFixedObjectsDidChange(m_renderView.frameView());
     }
 
     return compositedLayerMappingChanged || nonCompositedReasonChanged;
 }
 
 bool RenderLayerCompositor::updateLayerIfViewportConstrained(RenderLayer* layer)
 {
     RenderLayer::ViewportConstrainedNotCompositedReason viewportConstrainedNotCompositedReason = RenderLayer::NoNotCompositedReason;
-    m_compositingReasonFinder.requiresCompositingForPosition(layer->renderer(), layer, &viewportConstrainedNotCompositedReason);
+    m_compositingReasonFinder.requiresCompositingForPositionFixed(layer->renderer(), layer, &viewportConstrainedNotCompositedReason);
 
     if (layer->viewportConstrainedNotCompositedReason() != viewportConstrainedNotCompositedReason) {
         ASSERT(viewportConstrainedNotCompositedReason == RenderLayer::NoNotCompositedReason || layer->renderer()->style()->position() == FixedPosition);
         layer->setViewportConstrainedNotCompositedReason(viewportConstrainedNotCompositedReason);
         return true;
     }
     return false;
 }
 
 // These are temporary hacks to work around chicken-egg issues while we continue to refactor the compositing code.
@@ skipping 778 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "LocalFrame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore