chromeos: Simplify power supply info in PowerLibrary

chrome/browser/chromeos/low_battery_observer.h

Index: chrome/browser/chromeos/low_battery_observer.h
diff --git a/chrome/browser/chromeos/low_battery_observer.h b/chrome/browser/chromeos/low_battery_observer.h
index 950a1ac0156634899f84b86210f04d10b0654fe4..580ad24a22877c7eb138a09118917c475b4a423d 100644
--- a/chrome/browser/chromeos/low_battery_observer.h
+++ b/chrome/browser/chromeos/low_battery_observer.h
@@ -15,6 +15,8 @@ class Profile;
 
 namespace chromeos {
 
+struct PowerStatus;
+
 // The low battery observer displays a system notification when the battery
 // is low.
 
@@ -24,7 +26,7 @@ class LowBatteryObserver : public PowerLibrary::Observer {
   virtual ~LowBatteryObserver();
 
  private:
-  virtual void PowerChanged(PowerLibrary* object);
+  virtual void PowerChanged(const PowerStatus& power_status);
   virtual void SystemResumed() {}
 
   void Show(base::TimeDelta remaining, bool urgent);