Simplify BackgroundImageGeometry by removing meaningless distinctions.

Source/core/paint/BackgroundImageGeometry.h

Index: Source/core/paint/BackgroundImageGeometry.h
diff --git a/Source/core/paint/BackgroundImageGeometry.h b/Source/core/paint/BackgroundImageGeometry.h
index 8875376217fdc53e1dd1b00b08766a62a2513565..b4ed796d9224eb2bc0d43fcc3c429c03d33591bc 100644
--- a/Source/core/paint/BackgroundImageGeometry.h
+++ b/Source/core/paint/BackgroundImageGeometry.h
@@ -17,21 +17,12 @@ public:
         : m_hasNonLocalGeometry(false)
     { }
 
-    IntPoint destOrigin() const { return m_destOrigin; }
-    void setDestOrigin(const IntPoint& destOrigin)
-    {
-        m_destOrigin = destOrigin;
-    }
-
     IntRect destRect() const { return m_destRect; }
     void setDestRect(const IntRect& destRect)
     {
         m_destRect = destRect;
     }
 
-    // Returns the phase relative to the destination rectangle.
-    IntPoint relativePhase() const;
-
     IntPoint phase() const { return m_phase; }
     void setPhase(const IntPoint& phase)
     {
@@ -67,7 +58,6 @@ public:
 
 private:
     IntRect m_destRect;
-    IntPoint m_destOrigin;
     IntPoint m_phase;
     IntSize m_tileSize;
     IntSize m_repeatSpacing;