Remove the (already disabled) OverflowChangedEvent runtime flag

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 f93c9b763dbb7dad4ea25e543fb589a10b40c8c6..b43bca84f56d5be7e33867fe71b007374cd43177 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -629,7 +629,6 @@ private:
     bool contentsInCompositedLayer() const;
 
     void applyOverflowToViewport(LayoutObject*, ScrollbarMode& hMode, ScrollbarMode& vMode);
-    void updateOverflowStatus(bool horizontalOverflow, bool verticalOverflow);
 
     void updateCounters();
     void forceLayoutParentViewIfNeeded();
@@ -762,10 +761,6 @@ private:
     AtomicString m_mediaType;
     AtomicString m_mediaTypeWhenNotPrinting;
 
-    bool m_overflowStatusDirty;
-    bool m_horizontalOverflow;
-    bool m_verticalOverflow;
-
     // TODO(skobes): Move this to DocumentLoader::InitialScrollState.
     bool m_wasScrolledByUser;