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

chrome/browser/chromeos/login/login_utils.h

Index: chrome/browser/chromeos/login/login_utils.h
diff --git a/chrome/browser/chromeos/login/login_utils.h b/chrome/browser/chromeos/login/login_utils.h
index 976e7cab369ef11f03b350a522e11920e01f7279..50dcf396c8a272237f51b62238940a00423c1962 100644
--- a/chrome/browser/chromeos/login/login_utils.h
+++ b/chrome/browser/chromeos/login/login_utils.h
@@ -41,18 +41,18 @@ class LoginUtils {
   // Set LoginUtils singleton object for test purpose only!
   static void Set(LoginUtils* ptr);
 
-  // Thin wrapper around BrowserInit::LaunchBrowser().  Meant to be used in a
-  // Task posted to the UI thread.  Once the browser is launched the login
-  // host is deleted.
-  static void DoBrowserLaunch(Profile* profile,
-                              LoginDisplayHost* login_host);
-
   // Checks if the given username is whitelisted and allowed to sign-in to
   // this device.
   static bool IsWhitelisted(const std::string& username);
 
   virtual ~LoginUtils() {}
 
+  // Thin wrapper around BrowserInit::LaunchBrowser().  Meant to be used in a
+  // Task posted to the UI thread.  Once the browser is launched the login
+  // host is deleted.
+  virtual void DoBrowserLaunch(Profile* profile,
+                               LoginDisplayHost* login_host) = 0;
+
   // Loads and prepares profile for the session. Fires |delegate| in the end.
   // If |pending_requests| is true, there's a pending online auth request.
   // If |display_email| is not empty, user's displayed email will be set to