Remove m_margins member from FrameView

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index 18c4e13031da4f4058b6f483b275d5989865b41f..c3a1d37dfc5faa078a5eb204cb939bee4247a18b 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -300,7 +300,6 @@ void FrameView::init()
 {
     reset();
 
-    m_margins = LayoutSize(-1, -1); // undefined
     m_size = LayoutSize();
 
     // Propagate the marginwidth/height and scrolling modes to the view.
@@ -309,12 +308,6 @@ void FrameView::init()
         HTMLFrameElementBase* frameElt = toHTMLFrameElementBase(ownerElement);
         if (frameElt->scrollingMode() == ScrollbarAlwaysOff)
             setCanHaveScrollbars(false);
-        LayoutUnit marginWidth = frameElt->marginWidth();
-        LayoutUnit marginHeight = frameElt->marginHeight();
-        if (marginWidth != -1)
-            setMarginWidth(marginWidth);
-        if (marginHeight != -1)
-            setMarginHeight(marginHeight);
     }
 }
 
@@ -378,9 +371,6 @@ void FrameView::clear()
 
     reset();
 
-    if (RenderPart* renderer = m_frame->ownerRenderer())
-        renderer->viewCleared();
-
     setScrollbarsSuppressed(true);
 }
 
@@ -449,18 +439,6 @@ RenderView* FrameView::renderView() const
     return frame().contentRenderer();
 }
 
-void FrameView::setMarginWidth(LayoutUnit w)
-{
-    // make it update the rendering area when set
-    m_margins.setWidth(w);
-}
-
-void FrameView::setMarginHeight(LayoutUnit h)
-{
-    // make it update the rendering area when set
-    m_margins.setHeight(h);
-}
-
 void FrameView::setCanHaveScrollbars(bool canHaveScrollbars)
 {
     m_canHaveScrollbars = canHaveScrollbars;