Remove enable/disable wheel gestures setting.

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 08fb39bea65fdc46bc7c46cfbaaeff7d52410095..589b80e171c3162bd165f866d10f0a269f18a62c 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -2523,20 +2523,6 @@ InputHandler::ScrollStatus LayerTreeHostImpl::TryScroll(
     }
   }
 
-  if (IsWheelBasedScroll(type) &&
-      !active_tree()->settings().use_mouse_wheel_gestures) {
-    EventListenerProperties event_properties =
-        active_tree()->event_listener_properties(
-            EventListenerClass::kMouseWheel);
-    if (event_properties != EventListenerProperties::kNone) {
-      TRACE_EVENT0("cc", "LayerImpl::tryScroll: Failed WheelEventHandlers");
-      scroll_status.thread = InputHandler::SCROLL_ON_MAIN_THREAD;
-      scroll_status.main_thread_scrolling_reasons =
-          MainThreadScrollingReason::kEventHandlers;
-      return scroll_status;
-    }
-  }
-
   if (!scroll_node->data.scrollable) {
     TRACE_EVENT0("cc", "LayerImpl::tryScroll: Ignored not scrollable");
     scroll_status.thread = InputHandler::SCROLL_IGNORED;