Remove ObserveWheelEventAndResult callbacks since they are now gesture based.

content/renderer/input/render_widget_input_handler_delegate.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_INPUT_RENDER_WIDGET_INPUT_HANDLER_DELEGATE_H_
 #define CONTENT_RENDERER_INPUT_RENDER_WIDGET_INPUT_HANDLER_DELEGATE_H_
 
 #include <memory>
 
 #include "content/common/content_export.h"
@@ skipping 25 matching lines @@
 // transport input handling information across processes.
 class CONTENT_EXPORT RenderWidgetInputHandlerDelegate {
  public:
   // Called when animations due to focus change have completed (if any).
   virtual void FocusChangeComplete() = 0;
 
   // Check whether the WebWidget has any touch event handlers registered
   // at the given point.
   virtual bool HasTouchEventHandlersAt(const gfx::Point& point) const = 0;
 
-  // Called to forward a mouse wheel event to the compositor thread, to effect
-  // the elastic overscroll effect.
-  virtual void ObserveWheelEventAndResult(
-      const blink::WebMouseWheelEvent& wheel_event,
-      const gfx::Vector2dF& wheel_unused_delta,
-      bool event_processed) = 0;
-
   // Called to forward a gesture event to the compositor thread, to effect
   // the elastic overscroll effect.
   virtual void ObserveGestureEventAndResult(
       const blink::WebGestureEvent& gesture_event,
       const gfx::Vector2dF& unused_delta,
       bool event_processed) = 0;
 
   // Notifies that a key event was just handled.
   virtual void OnDidHandleKeyEvent() = 0;
 
@@ skipping 33 matching lines @@
   // won't be sent to WebKit or trigger DidHandleMouseEvent().
   virtual bool WillHandleMouseEvent(const blink::WebMouseEvent& event) = 0;
 
  protected:
   virtual ~RenderWidgetInputHandlerDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_INPUT_RENDER_WIDGET_INPUT_HANDLER_DELEGATE_H_