Add battery status to settings row in uber tray bubble.

chrome/browser/chromeos/system/ash_system_tray_delegate.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/chromeos/system/ash_system_tray_delegate.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/audio/audio_observer.h"
 #include "ash/system/bluetooth/bluetooth_observer.h"
@@ skipping 913 matching lines @@
   }
 
   // Overridden from PowerManagerClient::Observer.
   virtual void BrightnessChanged(int level, bool user_initiated) OVERRIDE {
     tray_->brightness_observer()->
         OnBrightnessChanged(static_cast<double>(level), user_initiated);
   }
 
   virtual void PowerChanged(const PowerSupplyStatus& power_status) OVERRIDE {
     power_supply_status_ = power_status;
-    ash::PowerStatusObserver* observer = tray_->power_status_observer();
-    if (observer)
-      observer->OnPowerStatusChanged(power_status);
+    FOR_EACH_OBSERVER(ash::PowerStatusObserver, tray_->power_status_observers(),
+        OnPowerStatusChanged(power_status));
   }
 
   virtual void SystemResumed() OVERRIDE {
     NotifyRefreshClock();
   }
 
   virtual void LockScreen() OVERRIDE {
     screen_locked_ = true;
     tray_->UpdateAfterLoginStatusChange(GetUserLoginStatus());
   }
@@ skipping 288 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegate);
 };
 
 }  // namespace
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate(ash::SystemTray* tray) {
   return new chromeos::SystemTrayDelegate(tray);
 }
 
 }  // namespace chromeos