Incorporate comments in Dbus code and add Eol icon

chrome/browser/chromeos/eol_notification.h

 // Copyright 2016 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 CHROME_BROWSER_CHROMEOS_EOL_NOTIFICATION_H_
 #define CHROME_BROWSER_CHROMEOS_EOL_NOTIFICATION_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/profiles/profile.h"
+#include "third_party/cros_system_api/dbus/update_engine/dbus-constants.h"
 
 namespace message_center {
 class MessageCenter;
 }
 
 namespace chromeos {
 
 // EolNotification is created when user logs in. It is
 // used to check current EndOfLife Status of the device,
 // and show notification accordingly.
 class EolNotification final {
  public:
   explicit EolNotification(Profile* profile);
   ~EolNotification();
 
   // Check Eol status from update engine.
   void CheckEolStatus();
 
  private:
   // Callback invoked when |GetEolStatus()| has finished.
-  void OnEolStatus(int status);
+  void OnEolStatus(update_engine::EndOfLifeStatus status);
 
   // Create or updates the notfication.
   void Update();
 
   // Returns messages that applys to this eol status.
   base::string16 GetEolMessage();
 
   // Profile which is associated with the EndOfLife notification.
   Profile* const profile_;
 
-  // Device Eol status.
-  int status_;
+  // Device EndOfLife status.
+  update_engine::EndOfLifeStatus status_;
 
   // Factory of callbacks.
   base::WeakPtrFactory<EolNotification> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EolNotification);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_EOL_NOTIFICATION_H_