Remove ObserveWheelEventAndResult callbacks since they are now gesture based.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index ee171f595d950efcb2d85b3a3de5361b38a6517a..9ea648d9f7c896e90b83517a10f1eac34a1037ec 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -964,27 +964,6 @@ bool RenderWidget::HasTouchEventHandlersAt(const gfx::Point& point) const {
   return true;
 }
 
-void RenderWidget::ObserveWheelEventAndResult(
-    const blink::WebMouseWheelEvent& wheel_event,
-    const gfx::Vector2dF& wheel_unused_delta,
-    bool event_processed) {
-  if (!compositor_deps_->IsElasticOverscrollEnabled())
-    return;
-
-  cc::InputHandlerScrollResult scroll_result;
-  scroll_result.did_scroll = event_processed;
-  scroll_result.did_overscroll_root = !wheel_unused_delta.IsZero();
-  scroll_result.unused_scroll_delta = wheel_unused_delta;
-
-  RenderThreadImpl* render_thread = RenderThreadImpl::current();
-  InputHandlerManager* input_handler_manager =
-      render_thread ? render_thread->input_handler_manager() : NULL;
-  if (input_handler_manager) {
-    input_handler_manager->ObserveWheelEventAndResultOnMainThread(
-        routing_id_, wheel_event, scroll_result);
-  }
-}
-
 void RenderWidget::ObserveGestureEventAndResult(
     const blink::WebGestureEvent& gesture_event,
     const gfx::Vector2dF& unused_delta,