Add SessionStateObserver with ActiveUserChanged()

chrome/browser/ui/ash/session_state_delegate.h

Index: chrome/browser/ui/ash/session_state_delegate.h
diff --git a/chrome/browser/ui/ash/session_state_delegate.h b/chrome/browser/ui/ash/session_state_delegate.h
deleted file mode 100644
index 50a3feb600032ef616e0545af43895d6082c3c01..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/ash/session_state_delegate.h
+++ /dev/null
@@ -1,38 +0,0 @@
-// Copyright (c) 2013 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_UI_ASH_SESSION_STATE_DELEGATE_H_
-#define CHROME_BROWSER_UI_ASH_SESSION_STATE_DELEGATE_H_
-
-#include "ash/session_state_delegate.h"
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-
-class SessionStateDelegate : public ash::SessionStateDelegate {
- public:
-  SessionStateDelegate();
-  virtual ~SessionStateDelegate();
-
-  // ash::SessionStateDelegate:
-  virtual int GetMaximumNumberOfLoggedInUsers() const OVERRIDE;
-  virtual int NumberOfLoggedInUsers() const OVERRIDE;
-  virtual bool IsActiveUserSessionStarted() const OVERRIDE;
-  virtual bool CanLockScreen() const OVERRIDE;
-  virtual bool IsScreenLocked() const OVERRIDE;
-  virtual void LockScreen() OVERRIDE;
-  virtual void UnlockScreen() OVERRIDE;
-  virtual const base::string16 GetUserDisplayName(
-      ash::MultiProfileIndex index) const OVERRIDE;
-  virtual const std::string GetUserEmail(
-      ash::MultiProfileIndex index) const OVERRIDE;
-  virtual const gfx::ImageSkia& GetUserImage(
-      ash::MultiProfileIndex index) const OVERRIDE;
-  virtual void GetLoggedInUsers(ash::UserEmailList* users) OVERRIDE;
-  virtual void SwitchActiveUser(const std::string& email) OVERRIDE;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SessionStateDelegate);
-};
-
-#endif  // CHROME_BROWSER_UI_ASH_SESSION_STATE_DELEGATE_H_