Remove m_shouldUpdateWhileOffscreen 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 5fd8768814850c1b7021a108dc41a92b64837309..c3612f6519a0d36a57a0d3e54cf3f4d8152f5737 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -141,10 +141,6 @@ public:
     void setBaseBackgroundColor(const Color&);
     void updateBackgroundRecursively(const Color&, bool);
 
-    bool shouldUpdateWhileOffscreen() const;
-    void setShouldUpdateWhileOffscreen(bool);
-    bool shouldUpdate() const;
-
     void adjustViewSize();
 
     virtual IntRect windowClipRect(bool clipToContents = true) const OVERRIDE;
@@ -507,8 +503,6 @@ private:
     bool m_isTrackingRepaints; // Used for testing.
     Vector<IntRect> m_trackedRepaintRects;
 
-    bool m_shouldUpdateWhileOffscreen;
-
     RefPtr<Node> m_nodeToDraw;
     PaintBehavior m_paintBehavior;
     bool m_isPainting;