Stop using [Client=...] feature of Mojom for BatteryMonitor

device/battery/battery_status_service.h

 // Copyright 2014 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.
 
 #ifndef DEVICE_BATTERY_BATTERY_STATUS_SERVICE_H_
 #define DEVICE_BATTERY_BATTERY_STATUS_SERVICE_H_
 
 #include "base/callback_list.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
@@ skipping 12 matching lines @@
   typedef base::Callback<void(const BatteryStatus&)> BatteryUpdateCallback;
   typedef base::CallbackList<void(const BatteryStatus&)>
       BatteryUpdateCallbackList;
   typedef BatteryUpdateCallbackList::Subscription BatteryUpdateSubscription;
 
   // Returns the BatteryStatusService singleton.
   static BatteryStatusService* GetInstance();
 
   // Adds a callback to receive battery status updates.  Must be called on the
   // main thread. The callback itself will be called on the main thread as well.
+  // NOTE: The callback may be run before AddCallback returns!
   scoped_ptr<BatteryUpdateSubscription> AddCallback(
       const BatteryUpdateCallback& callback);
 
   // Gracefully clean-up.
   void Shutdown();
 
   // Injects a custom battery status manager for testing purposes.
   void SetBatteryManagerForTesting(
       scoped_ptr<BatteryStatusManager> test_battery_manager);
 
@@ skipping 20 matching lines @@
   BatteryStatus status_;
   bool status_updated_;
   bool is_shutdown_;
 
   DISALLOW_COPY_AND_ASSIGN(BatteryStatusService);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BATTERY_BATTERY_STATUS_SERVICE_H_