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

components/arc/power/arc_power_bridge.cc

Index: components/arc/power/arc_power_bridge.cc
diff --git a/components/arc/power/arc_power_bridge.cc b/components/arc/power/arc_power_bridge.cc
index b918147ab1ed5f3a973e44762c2fe8856e00be78..172d8fe0a775e5db379846a36de468eec63e125e 100644
--- a/components/arc/power/arc_power_bridge.cc
+++ b/components/arc/power/arc_power_bridge.cc
@@ -53,11 +53,11 @@ void ArcPowerBridge::OnAcquireDisplayWakeLock(
 
   int wake_lock_id = -1;
   switch (type) {
-    case DISPLAY_WAKE_LOCK_TYPE_BRIGHT:
+    case DisplayWakeLockType::BRIGHT:
       wake_lock_id = controller->AddScreenWakeLock(
           chromeos::PowerPolicyController::REASON_OTHER, "ARC");
       break;
-    case DISPLAY_WAKE_LOCK_TYPE_DIM:
+    case DisplayWakeLockType::DIM:
       wake_lock_id = controller->AddDimWakeLock(
           chromeos::PowerPolicyController::REASON_OTHER, "ARC");
       break;