Remove position: sticky

Source/core/rendering/RenderBoxModelObject.h

Index: Source/core/rendering/RenderBoxModelObject.h
diff --git a/Source/core/rendering/RenderBoxModelObject.h b/Source/core/rendering/RenderBoxModelObject.h
index c61f91e3cc606bb1e60f0d06e721d9b97afac06e..8f0c0b5c7b85178c2c1d3bb1f4df44a4bc9ddffd 100644
--- a/Source/core/rendering/RenderBoxModelObject.h
+++ b/Source/core/rendering/RenderBoxModelObject.h
@@ -49,7 +49,6 @@ enum ContentChangeType {
 };
 
 class RenderTextFragment;
-class StickyPositionViewportConstraints;
 
 // This class is the base for all objects that adhere to the CSS box model as described
 // at http://www.w3.org/TR/CSS21/box.html
@@ -62,10 +61,6 @@ public:
     LayoutSize relativePositionOffset() const;
     LayoutSize relativePositionLogicalOffset() const { return style()->isHorizontalWritingMode() ? relativePositionOffset() : relativePositionOffset().transposedSize(); }
 
-    void computeStickyPositionConstraints(StickyPositionViewportConstraints&, const FloatRect& constrainingRect) const;
-    LayoutSize stickyPositionOffset() const;
-    LayoutSize stickyPositionLogicalOffset() const { return style()->isHorizontalWritingMode() ? stickyPositionOffset() : stickyPositionOffset().transposedSize(); }
-
     LayoutSize offsetForInFlowPosition() const;
 
     // IE extensions. Used to calculate offsetWidth/Height.  Overridden by inlines (RenderFlow)
@@ -305,8 +300,6 @@ private:
     LayoutUnit computedCSSPadding(const Length&) const;
     virtual bool isBoxModelObject() const OVERRIDE FINAL { return true; }
 
-    virtual LayoutRect frameRectForStickyPositioning() const = 0;
-
     IntSize calculateFillTileSize(const FillLayer*, const IntSize& scaledPositioningAreaSize) const;
 
     RoundedRect getBackgroundRoundedRect(const LayoutRect&, InlineFlowBox*, LayoutUnit inlineBoxWidth, LayoutUnit inlineBoxHeight,