Change mojo enums to be scoped enums in the generated C++ bindings.

components/mus/ws/test_change_tracker.cc

Index: components/mus/ws/test_change_tracker.cc
diff --git a/components/mus/ws/test_change_tracker.cc b/components/mus/ws/test_change_tracker.cc
index a08f923de65a8620157e8c74403bdf90570f96d5..2ea6796428be2ce02612d45bec0b82b15a08fb57 100644
--- a/components/mus/ws/test_change_tracker.cc
+++ b/components/mus/ws/test_change_tracker.cc
@@ -31,7 +31,7 @@ std::string RectToString(const mojo::Rect& rect) {
 }
 
 std::string DirectionToString(mojom::OrderDirection direction) {
-  return direction == mojom::ORDER_DIRECTION_ABOVE ? "above" : "below";
+  return direction == mojom::OrderDirection::ABOVE ? "above" : "below";
 }
 
 std::string ChangeToDescription1(const Change& change) {
@@ -187,7 +187,7 @@ Change::Change()
       window_id2(0),
       window_id3(0),
       event_action(0),
-      direction(mojom::ORDER_DIRECTION_ABOVE),
+      direction(mojom::OrderDirection::ABOVE),
       bool_value(false),
       change_id(0u) {}
 
@@ -317,7 +317,7 @@ void TestChangeTracker::OnWindowInputEvent(Id window_id,
   Change change;
   change.type = CHANGE_TYPE_INPUT_EVENT;
   change.window_id = window_id;
-  change.event_action = event->action;
+  change.event_action = static_cast<int32_t>(event->action);
   AddChange(change);
 }
 
@@ -348,7 +348,7 @@ void TestChangeTracker::OnWindowPredefinedCursorChanged(
   Change change;
   change.type = CHANGE_TYPE_CURSOR_CHANGED;
   change.window_id = window_id;
-  change.cursor_id = cursor_id;
+  change.cursor_id = static_cast<int32_t>(cursor_id);
   AddChange(change);
 }