Add module suffix in .mojom files for components/arc

components/arc/common/power.mojom

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module arc;
+module arc.mojom;
 
 // Enumerates the types of wake lock the ARC instance can request from the
 // host.
 [Extensible]
 enum DisplayWakeLockType {
   // Does not allow the screen to dim, turn off, or lock; prevents
   // idle suspend.
   BRIGHT = 0,
 
   // Allows dimming the screen, but prevents it from turning off or locking.
@@ skipping 10 matching lines @@
   [MinVersion=1] IsDisplayOn@2() => (bool is_on);
 };
 
 interface PowerInstance {
   // Establishes full-duplex communication with the host.
   Init@0(PowerHost host_ptr);
 
   // Alerts the instance to a change in interactive state.
   [MinVersion=1] SetInteractive@1(bool enabled);
 };