Remove m_margins member from FrameView

Source/core/frame/FrameView.h

Index: Source/core/frame/FrameView.h
diff --git a/Source/core/frame/FrameView.h b/Source/core/frame/FrameView.h
index 6bfcc55917deb27af9b2061aece98f46bff34124..5fd8768814850c1b7021a108dc41a92b64837309 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -77,11 +77,6 @@ public:
 
     RenderView* renderView() const;
 
-    LayoutUnit marginWidth() const { return m_margins.width(); } // -1 means default
-    LayoutUnit marginHeight() const { return m_margins.height(); } // -1 means default
-    void setMarginWidth(LayoutUnit);
-    void setMarginHeight(LayoutUnit);
-
     virtual void setCanHaveScrollbars(bool) OVERRIDE;
     void updateCanHaveScrollbars();
 
@@ -450,7 +445,6 @@ private:
     static bool s_inPaintContents;
 
     LayoutSize m_size;
-    LayoutSize m_margins;
 
     typedef HashSet<RefPtr<RenderEmbeddedObject> > EmbeddedObjectSet;
     EmbeddedObjectSet m_widgetUpdateSet;