Add SessionStateObserver with ActiveUserChanged()

chrome/browser/chromeos/login/crash_restore_browsertest.cc

 // Copyright 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.
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
@@ skipping 62 matching lines @@
     public UserManager::UserSessionStateObserver {
  public:
   UserSessionRestoreObserver()
       : running_loop_(false),
         user_sessions_restored_(UserManager::Get()->UserSessionsRestored()) {
     if (!user_sessions_restored_)
       UserManager::Get()->AddSessionStateObserver(this);
   }
   virtual ~UserSessionRestoreObserver() {}
 
-  virtual void ActiveUserHashChanged(const std::string& hash) OVERRIDE {
-  }
   virtual void PendingUserSessionsRestoreFinished() OVERRIDE {
     user_sessions_restored_ = true;
     UserManager::Get()->RemoveSessionStateObserver(this);
     if (!running_loop_)
       return;
 
     message_loop_runner_->Quit();
     running_loop_ = false;
   }
 
@@ skipping 54 matching lines @@
             users[0]->username_hash());
   EXPECT_EQ(kUserId2, users[1]->email());
   EXPECT_EQ(CryptohomeClient::GetStubSanitizedUsername(kUserId2),
             users[1]->username_hash());
   EXPECT_EQ(kUserId1, users[2]->email());
   EXPECT_EQ(CryptohomeClient::GetStubSanitizedUsername(kUserId1),
             users[2]->username_hash());
 }
 
 }  // namespace chromeos