Remove some dead code from rendering/ folder

Source/core/rendering/RenderBox.h

Index: Source/core/rendering/RenderBox.h
diff --git a/Source/core/rendering/RenderBox.h b/Source/core/rendering/RenderBox.h
index 61de54fc1cd31ede0df98edaf84dd5475086b71e..01f794f00387c67ab8ef8701aae8cffebe713c88 100644
--- a/Source/core/rendering/RenderBox.h
+++ b/Source/core/rendering/RenderBox.h
@@ -330,7 +330,6 @@ public:
     virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE;
     virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE;
 
-    LayoutRect reflectionBox() const;
     int reflectionOffset() const;
     // Given a rect in the object's coordinate space, returns the corresponding rect in the reflection.
     LayoutRect reflectedRect(const LayoutRect&) const;
@@ -526,8 +525,6 @@ public:
         return true;
     }
 
-    LayoutRect maskClipRect();
-
     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE;
 
     void removeFloatingOrPositionedChildFromBlockLists();