Move have_wheel_event_handlers to WebLayerTreeView.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 03048f3e7f42660bcc569c3b92ae4d4fa795ceb7..2e0e5b98791718a419b4fe75fdc26803d44b097f 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -571,16 +571,8 @@ bool LayerTreeHostImpl::IsCurrentlyScrollingLayerAt(
   return false;
 }
 
-bool LayerTreeHostImpl::HaveWheelEventHandlersAt(
-    const gfx::Point& viewport_point) {
-  gfx::PointF device_viewport_point = gfx::ScalePoint(
-      gfx::PointF(viewport_point), active_tree_->device_scale_factor());
-
-  LayerImpl* layer_impl =
-      active_tree_->FindLayerWithWheelHandlerThatIsHitByPoint(
-          device_viewport_point);
-
-  return layer_impl != NULL;
+bool LayerTreeHostImpl::HaveWheelEventHandlers() const {
+  return active_tree_->have_wheel_event_handlers();
 }
 
 static LayerImpl* NextLayerInScrollOrder(LayerImpl* layer) {