Move scroll event handlers from layer to layer tree view.

cc/blink/web_layer_impl.cc

Index: cc/blink/web_layer_impl.cc
diff --git a/cc/blink/web_layer_impl.cc b/cc/blink/web_layer_impl.cc
index 6d0e59347e4d4936e50070478d1d23ee84841148..6d3a2a654753b6d8449990e0d115baa47f268b61 100644
--- a/cc/blink/web_layer_impl.cc
+++ b/cc/blink/web_layer_impl.cc
@@ -320,14 +320,6 @@ bool WebLayerImpl::userScrollableVertical() const {
   return layer_->user_scrollable_vertical();
 }
 
-void WebLayerImpl::setHaveScrollEventHandlers(bool have_scroll_event_handlers) {
-  layer_->SetHaveScrollEventHandlers(have_scroll_event_handlers);
-}
-
-bool WebLayerImpl::haveScrollEventHandlers() const {
-  return layer_->have_scroll_event_handlers();
-}
-
 void WebLayerImpl::addMainThreadScrollingReasons(
     uint32_t main_thread_scrolling_reasons) {
   DCHECK(main_thread_scrolling_reasons);