First pass at removing position:fixed.

sky/engine/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 505 matching lines @@
     // FIXME(sky): remove this.
     Node* generatingNode() const { return node(); }
 
     Document& document() const { return m_node->document(); }
     LocalFrame* frame() const { return document().frame(); }
 
     // Returns the object containing this one. Can be different from parent for positioned elements.
     // If paintInvalidationContainer and paintInvalidationContainerSkipped are not null, on return *paintInvalidationContainerSkipped
     // is true if the renderer returned is an ancestor of paintInvalidationContainer.
     RenderObject* container(const RenderLayerModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
-    RenderBlock* containerForFixedPosition(const RenderLayerModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
 
     virtual RenderObject* hoverAncestor() const { return parent(); }
 
     Element* offsetParent() const;
 
     void markContainingBlocksForLayout(bool scheduleRelayout = true, RenderObject* newRoot = 0, SubtreeLayoutScope* = 0);
     void setNeedsLayout(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
     void setNeedsLayoutAndFullPaintInvalidation(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
     void clearNeedsLayout();
     void setChildNeedsLayout(MarkingBehavior = MarkContainingBlockChain, SubtreeLayoutScope* = 0);
     void setNeedsPositionedMovementLayout();
     void setPreferredLogicalWidthsDirty(MarkingBehavior = MarkContainingBlockChain);
     void clearPreferredLogicalWidthsDirty();
     void invalidateContainerPreferredLogicalWidths();
 
     void setNeedsLayoutAndPrefWidthsRecalc()
     {
         setNeedsLayout();
         setPreferredLogicalWidthsDirty();
     }
     void setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation()
     {
         setNeedsLayoutAndFullPaintInvalidation();
         setPreferredLogicalWidthsDirty();
     }
 
     void setPositionState(EPosition position)
     {
-        ASSERT((position != AbsolutePosition && position != FixedPosition) || isBox());
+        ASSERT(position != AbsolutePosition || isBox());
         m_bitfields.setPositionedState(position);
     }
     void clearPositionedState() { m_bitfields.clearPositionedState(); }
 
     void setFloating(bool isFloating) { m_bitfields.setFloating(isFloating); }
     void setInline(bool isInline) { m_bitfields.setIsInline(isInline); }
 
     void setHasBoxDecorationBackground(bool);
     void invalidateBackgroundObscurationStatus();
     virtual bool computeBackgroundIsKnownToBeObscured() { return false; }
@@ skipping 568 matching lines @@
         unsigned m_selectionState : 3; // SelectionState
         unsigned m_boxDecorationBackgroundState : 2; // BoxDecorationBackgroundState
 
     public:
         bool isOutOfFlowPositioned() const { return m_positionedState == IsOutOfFlowPositioned; }
         bool isRelPositioned() const { return m_positionedState == IsRelativelyPositioned; }
         bool isPositioned() const { return m_positionedState != IsStaticallyPositioned; }
 
         void setPositionedState(int positionState)
         {
+            // FIXME(sky): Simplify now that we don't have FixedPosition.
             // This mask maps FixedPosition and AbsolutePosition to IsOutOfFlowPositioned, saving one bit.
             m_positionedState = static_cast<PositionedState>(positionState & 0x3);
         }
         void clearPositionedState() { m_positionedState = StaticPosition; }
 
         ALWAYS_INLINE SelectionState selectionState() const { return static_cast<SelectionState>(m_selectionState); }
         ALWAYS_INLINE void setSelectionState(SelectionState selectionState) { m_selectionState = selectionState; }
 
         ALWAYS_INLINE BoxDecorationBackgroundState boxDecorationBackgroundState() const { return static_cast<BoxDecorationBackgroundState>(m_boxDecorationBackgroundState); }
         ALWAYS_INLINE void setBoxDecorationBackgroundState(BoxDecorationBackgroundState s) { m_boxDecorationBackgroundState = s; }
@@ skipping 190 matching lines @@
 void showTree(const blink::RenderObject*);
 void showLineTree(const blink::RenderObject*);
 void showRenderTree(const blink::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const blink::RenderObject* object1, const blink::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h