Remove some dead scrolling paths and unused params

public/web/WebWidgetClient.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 33 matching lines @@
 class WebString;
 class WebWidget;
 struct WebCursorInfo;
 struct WebSize;
 
 class WebWidgetClient {
 public:
     // Called when a region of the WebWidget needs to be re-painted.
     virtual void didInvalidateRect(const WebRect&) { }
 
-    // Called when a region of the WebWidget, given by clipRect, should be
-    // scrolled by the specified dx and dy amounts.
-    virtual void didScrollRect(int dx, int dy, const WebRect& clipRect) { }

[Ian Vollick, 2014/06/23 15:07:58]

I'm not sure when it disappeared, but there's no def'n of didScrollRect that
actually does anything, so I started unravelling things.

-
     // Called when the Widget has changed size as a result of an auto-resize.
     virtual void didAutoResize(const WebSize& newSize) { }
 
     // Attempt to initialize compositing for this widget. If this is successful,
     // layerTreeView() will return a valid WebLayerTreeView.
     virtual void initializeLayerTreeView() { }
 
     // Return a compositing view used for this widget. This is owned by the
     // WebWidgetClient.
     virtual WebLayerTreeView* layerTreeView() { return 0; }
@@ skipping 112 matching lines @@
     // Request the browser to show the IME for current input type.
     virtual void showImeIfNeeded() { }
 
 protected:
     ~WebWidgetClient() { }
 };
 
 } // namespace blink
 
 #endif