[cros] Use mocked URLFetcher and other mocks in ExistingUserController tests.

chrome/browser/chromeos/login/login_display.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_DISPLAY_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_DISPLAY_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 26 matching lines @@
     // Sets the displayed email for the next login attempt with |CompleteLogin|.
     // If it succeeds, user's displayed email value will be updated to |email|.
     virtual void SetDisplayEmail(const std::string& email) = 0;
 
     // Complete sign process with specified |username| and |password|.
     // Used for new users authenticated through an extension.
     virtual void CompleteLogin(const std::string& username,
                                const std::string& password) = 0;
 
     // Sign in using |username| and |password| specified.
-    // Used for both known users only.
+    // Used for known users only.
     virtual void Login(const std::string& username,
                        const std::string& password) = 0;
 
     // Sign in as a demo user.
     virtual void LoginAsDemoUser() = 0;
 
     // Sign in into Guest session.
     virtual void LoginAsGuest() = 0;
 
     // Sign out the currently signed in user.
@@ skipping 78 matching lines @@
 
   // Bounds of the login UI background.
   gfx::Rect background_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginDisplay);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_DISPLAY_H_