This CL replaces user_manager::UserID with AccountId.

chrome/browser/chromeos/login/lock/screen_locker_browsertest.cc

 // Copyright 2014 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 "chrome/browser/chromeos/login/lock/screen_locker.h"
 
 #include "ash/wm/window_state.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 137 matching lines @@
   if (!tester->IsLocked())
     lock_state_observer.Wait();
 
   // Test to make sure that the widget is actually appearing and is of
   // reasonable size, preventing a regression of
   // http://code.google.com/p/chromium-os/issues/detail?id=5987
   gfx::Rect lock_bounds = tester->GetChildWidget()->GetWindowBoundsInScreen();
   EXPECT_GT(lock_bounds.width(), 10);
   EXPECT_GT(lock_bounds.height(), 10);
 
-  UserContext user_context(chromeos::login::kStubUser);
+  UserContext user_context(login::StubAccountId());
   user_context.SetKey(Key("pass"));
   tester->InjectStubUserContext(user_context);
   EXPECT_TRUE(tester->IsLocked());
   tester->EnterPassword("fail");
   content::RunAllPendingInMessageLoop();
   EXPECT_TRUE(tester->IsLocked());
   tester->EnterPassword("pass");
   content::RunAllPendingInMessageLoop();
   // Successful authentication clears the lock screen and tells the
   // SessionManager to announce this over DBus.
@@ skipping 36 matching lines @@
   }
   {
     Waiter waiter(browser());
     ScreenLocker::Show();
     tester->EmulateWindowManagerReady();
     waiter.Wait(true /* locked */, true /* full screen */);
     EXPECT_TRUE(browser_window->IsFullscreen());
     EXPECT_FALSE(window_state->hide_shelf_when_fullscreen());
     EXPECT_TRUE(tester->IsLocked());
   }
-  UserContext user_context(chromeos::login::kStubUser);
+  UserContext user_context(login::StubAccountId());
   user_context.SetKey(Key("pass"));
   tester->InjectStubUserContext(user_context);
   tester->EnterPassword("pass");
   content::RunAllPendingInMessageLoop();
   EXPECT_FALSE(tester->IsLocked());
   {
     Waiter waiter(browser());
     browser()
         ->exclusive_access_manager()
         ->fullscreen_controller()
@@ skipping 85 matching lines @@
   EXPECT_EQ("", tester->GetPassword());
 
   // Close the locker to match expectations.
   ScreenLocker::Hide();
   content::RunAllPendingInMessageLoop();
   EXPECT_FALSE(tester->IsLocked());
   EXPECT_TRUE(VerifyLockScreenDismissed());
 }
 
 }  // namespace chromeos