Remove m_margins member from FrameView

Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 59 matching lines @@
 
     virtual void invalidateRect(const IntRect&) OVERRIDE;
     virtual void setFrameRect(const IntRect&) OVERRIDE;
 
     virtual bool scheduleAnimation() OVERRIDE;
 
     Frame& frame() const { return *m_frame; }
 
     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();
 
     virtual PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation) OVERRIDE;
 
     virtual void setContentsSize(const IntSize&) OVERRIDE;
 
     void layout(bool allowSubtree = true);
     bool didFirstLayout() const;
     void layoutTimerFired(Timer<FrameView>*);
@@ skipping 348 matching lines @@
     void removeFromAXObjectCache();
 
     bool isMainFrame() const;
 
     void setLayoutSizeInternal(const IntSize&);
 
     static double s_currentFrameTimeStamp; // used for detecting decoded resource thrash in the cache
     static bool s_inPaintContents;
 
     LayoutSize m_size;
-    LayoutSize m_margins;
 
     typedef HashSet<RefPtr<RenderEmbeddedObject> > EmbeddedObjectSet;
     EmbeddedObjectSet m_widgetUpdateSet;
 
     // FIXME: These are just "children" of the FrameView and should be RefPtr<Widget> instead.
     HashSet<RefPtr<RenderWidget> > m_widgets;
 
     RefPtr<Frame> m_frame;
 
     bool m_doFullRepaint;
@@ skipping 116 matching lines @@
     static const unsigned visualPixelThreshold = 32 * 32;
     if (m_visuallyNonEmptyPixelCount > visualPixelThreshold)
         setIsVisuallyNonEmpty();
 }
 
 DEFINE_TYPE_CASTS(FrameView, Widget, widget, widget->isFrameView(), widget.isFrameView());
 
 } // namespace WebCore
 
 #endif // FrameView_h