Remove a bunch of fixed position dead code.

sky/engine/core/rendering/compositing/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 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 903 matching lines @@
     m_backgroundLayer->setPosition(FloatPoint());
     if (backgroundSize != m_backgroundLayer->size()) {
         m_backgroundLayer->setSize(backgroundSize);
         m_backgroundLayer->setNeedsDisplay();
     }
     m_backgroundLayer->setOffsetFromRenderer(m_graphicsLayer->offsetFromRenderer());
 }
 
 void CompositedLayerMapping::registerScrollingLayers()
 {
+    // FIXME(sky): Remove this whole function. I think this doesn't do anything now that we don't support position:fixed.
+
     // Register fixed position layers and their containers with the scrolling coordinator.
     ScrollingCoordinator* scrollingCoordinator = scrollingCoordinatorFromLayer(m_owningLayer);
     if (!scrollingCoordinator)
         return;
 
-    scrollingCoordinator->updateLayerPositionConstraint(&m_owningLayer);
-
     // Page scale is applied as a transform on the root render view layer. Because the scroll
     // layer is further up in the hierarchy, we need to avoid marking the root render view
     // layer as a container.
     bool isContainer = m_owningLayer.hasTransform() && !m_owningLayer.isRootLayer();
     // FIXME: we should make certain that childForSuperLayers will never be the m_squashingContainmentLayer here
     scrollingCoordinator->setLayerIsContainerForFixedPositionLayers(childForSuperlayers(), isContainer);
 }
 
 void CompositedLayerMapping::updateInternalHierarchy()
 {
@@ skipping 1303 matching lines @@
     } else if (graphicsLayer == m_scrollingBlockSelectionLayer.get()) {
         name = "Scrolling Block Selection Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink