Refactor getExcludedIntervals since only one LineSegment is ever returned

Source/core/rendering/shapes/RectangleShape.h

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. 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.
@@ skipping 31 matching lines @@
 public:
     RectangleShape(const FloatRect& bounds, const FloatSize& radii)
         : Shape()
         , m_bounds(bounds)
         , m_radii(radii)
     {
     }
 
     virtual LayoutRect shapeMarginLogicalBoundingBox() const OVERRIDE { return static_cast<LayoutRect>(shapeMarginBounds()); }
     virtual bool isEmpty() const OVERRIDE { return m_bounds.isEmpty(); }
-    virtual void getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const OVERRIDE;
+    virtual LineSegment getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const OVERRIDE;
     virtual void buildDisplayPaths(DisplayPaths&) const OVERRIDE;
 
 private:
     FloatRect shapeMarginBounds() const;
 
     float rx() const { return m_radii.width(); }
     float ry() const { return m_radii.height(); }
     float x() const { return m_bounds.x(); }
     float y() const { return m_bounds.y(); }
     float width() const { return m_bounds.width(); }
     float height() const { return m_bounds.height(); }
 
     FloatRect m_bounds;
     FloatSize m_radii;
 };
 
 } // namespace blink
 
 #endif // RectangleShape_h