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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebWidgetClient_h
 #define WebWidgetClient_h
 
+#define DID_SCROLL_RECT_DOES_NOT_EXIST 1
+
 #include "WebNavigationPolicy.h"
 #include "public/platform/WebCommon.h"
 #include "public/platform/WebLayerTreeView.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebScreenInfo.h"
 #include "public/web/WebTouchAction.h"
 
 namespace blink {
 
 class WebGestureEvent;
 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) { }
-
     // 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