Move have_wheel_event_handlers to WebLayerTreeView.

ui/events/blink/input_handler_proxy.cc

Index: ui/events/blink/input_handler_proxy.cc
diff --git a/ui/events/blink/input_handler_proxy.cc b/ui/events/blink/input_handler_proxy.cc
index 05dfaaa5399dc44b3d83d448db9ede08bcc5f4e2..7d74ed7b16854d079d20ca297ca0b8176c9a5be4 100644
--- a/ui/events/blink/input_handler_proxy.cc
+++ b/ui/events/blink/input_handler_proxy.cc
@@ -288,8 +288,7 @@ InputHandlerProxy::EventDisposition InputHandlerProxy::HandleInputEvent(
       const WebGestureEvent& gesture_event =
           static_cast<const WebGestureEvent&>(event);
       if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad &&
-          input_handler_->HaveWheelEventHandlersAt(
-              gfx::Point(gesture_event.x, gesture_event.y))) {
+          input_handler_->HaveWheelEventHandlers()) {
         return DID_NOT_HANDLE;
       } else {
         input_handler_->PinchGestureBegin();