Remove some dead scrolling paths and unused params

Source/web/WebPopupMenuImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 102 matching lines @@
     friend class WebPopupMenu; // For WebPopupMenu::create.
     friend class WTF::RefCounted<WebPopupMenuImpl>;
 
     WebPopupMenuImpl(WebWidgetClient*);
     ~WebPopupMenuImpl();
 
     // WebCore::HostWindow methods:
     virtual void invalidateContentsAndRootView(const WebCore::IntRect&) OVERRIDE FINAL;
     virtual void invalidateContentsForSlowScroll(const WebCore::IntRect&) OVERRIDE FINAL;
     virtual void scheduleAnimation() OVERRIDE FINAL;
-    virtual void scroll(
-        const WebCore::IntSize& scrollDelta, const WebCore::IntRect& scrollRect,
-        const WebCore::IntRect& clipRect) OVERRIDE FINAL;
+    virtual void scroll(const WebCore::IntRect& clipRect) OVERRIDE FINAL;
     virtual WebCore::IntRect rootViewToScreen(const WebCore::IntRect&) const OVERRIDE FINAL;
     virtual WebScreenInfo screenInfo() const OVERRIDE FINAL;
 
     // WebCore::FramelessScrollViewClient methods:
     virtual void popupClosed(WebCore::FramelessScrollView*) OVERRIDE FINAL;
 
     WebWidgetClient* m_client;
     WebSize m_size;
 
     WebLayerTreeView* m_layerTreeView;
     OwnPtr<WebContentLayer> m_rootLayer;
 
     WebPoint m_lastMousePosition;
 
     // This is a non-owning ref. The popup will notify us via popupClosed()
     // before it is destroyed.
     WebCore::FramelessScrollView* m_widget;
 };
 
 DEFINE_TYPE_CASTS(WebPopupMenuImpl, WebWidget, widget, widget->isPopupMenu(), widget.isPopupMenu());
 // WebPopupMenuImpl is the only implementation of FramelessScrollViewClient, so
 // no need for further checking.
 DEFINE_TYPE_CASTS(WebPopupMenuImpl, WebCore::FramelessScrollViewClient, client, true, true);
 
 } // namespace blink
 
 #endif