Remove dead notification for number of wheel event handlers

Turns out no-one needs this.

BUG=359566

Review URL: https://codereview.chromium.org/315653003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275467 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/render_view_host_impl.cc

@@ -990,8 +990,6 @@ bool RenderViewHostImpl::OnMessageReceived(const IPC::Message& msg) {
                         OnDidChangeScrollOffset)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidChangeScrollOffsetPinningForMainFrame,
                         OnDidChangeScrollOffsetPinningForMainFrame)
-    IPC_MESSAGE_HANDLER(ViewHostMsg_DidChangeNumWheelEvents,
-                        OnDidChangeNumWheelEvents)
     IPC_MESSAGE_HANDLER(ViewHostMsg_RouteCloseEvent,
                         OnRouteCloseEvent)
     IPC_MESSAGE_HANDLER(ViewHostMsg_RouteMessageEvent, OnRouteMessageEvent)
@@ -1225,9 +1223,6 @@ void RenderViewHostImpl::OnDidChangeScrollOffsetPinningForMainFrame(
     view_->SetScrollOffsetPinning(is_pinned_to_left, is_pinned_to_right);
 }
 
-void RenderViewHostImpl::OnDidChangeNumWheelEvents(int count) {
-}
-
 void RenderViewHostImpl::OnRouteCloseEvent() {
   // Have the delegate route this to the active RenderViewHost.
   delegate_->RouteCloseEvent(this);

content/browser/renderer_host/render_view_host_impl.h

@@ -494,7 +494,6 @@ class CONTENT_EXPORT RenderViewHostImpl
   void OnDidChangeScrollOffset();
   void OnDidChangeScrollOffsetPinningForMainFrame(bool is_pinned_to_left,
                                                   bool is_pinned_to_right);
-  void OnDidChangeNumWheelEvents(int count);
   void OnPasteFromSelectionClipboard();
   void OnRouteCloseEvent();
   void OnRouteMessageEvent(const ViewMsg_PostMessage_Params& params);

content/common/view_messages.h

@@ -1293,10 +1293,6 @@ IPC_MESSAGE_ROUTED2(ViewHostMsg_DidChangeScrollOffsetPinningForMainFrame,
                     bool /* pinned_to_left */,
                     bool /* pinned_to_right */)
 
-// Notifies that the number of JavaScript scroll handlers changed.
-IPC_MESSAGE_ROUTED1(ViewHostMsg_DidChangeNumWheelEvents,
-                    int /* count */)
-
 // Notifies whether there are JavaScript touch event handlers or not.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_HasTouchEventHandlers,
                     bool /* has_handlers */)

content/renderer/render_view_impl.cc

@@ -1734,10 +1734,6 @@ void RenderViewImpl::focusedNodeChanged(const WebNode& node) {
   FOR_EACH_OBSERVER(RenderViewObserver, observers_, FocusedNodeChanged(node));
 }
 
-void RenderViewImpl::numberOfWheelEventHandlersChanged(unsigned num_handlers) {
-  Send(new ViewHostMsg_DidChangeNumWheelEvents(routing_id_, num_handlers));
-}
-
 void RenderViewImpl::didUpdateLayout() {
   FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidUpdateLayout());
 

content/renderer/render_view_impl.h

@@ -435,7 +435,6 @@ class CONTENT_EXPORT RenderViewImpl
   virtual void focusNext();
   virtual void focusPrevious();
   virtual void focusedNodeChanged(const blink::WebNode& node);
-  virtual void numberOfWheelEventHandlersChanged(unsigned num_handlers);
   virtual void didUpdateLayout();
 #if defined(OS_ANDROID)
   virtual bool didTapMultipleTargets(