cros: Use ScreenManager as a component instead of deriving WizardController from it

chrome/browser/chromeos/login/screens/network_screen_browsertest.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/screens/network_screen.h"
 
 #include <memory>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 53 matching lines @@
 
     fake_session_manager_client_ = new FakeSessionManagerClient;
     DBusThreadManager::GetSetterForTesting()->SetSessionManagerClient(
         std::unique_ptr<SessionManagerClient>(fake_session_manager_client_));
   }
 
   void SetUpOnMainThread() override {
     WizardInProcessBrowserTest::SetUpOnMainThread();
     mock_base_screen_delegate_.reset(new MockBaseScreenDelegate());
     ASSERT_TRUE(WizardController::default_controller() != nullptr);
-    network_screen_ =
-        NetworkScreen::Get(WizardController::default_controller());
+    network_screen_ = NetworkScreen::Get(
+        WizardController::default_controller()->screen_manager());
     ASSERT_TRUE(network_screen_ != nullptr);
     ASSERT_EQ(WizardController::default_controller()->current_screen(),
               network_screen_);
     network_screen_->base_screen_delegate_ = mock_base_screen_delegate_.get();
     ASSERT_TRUE(network_screen_->view_ != nullptr);
 
     mock_network_state_helper_ = new login::MockNetworkStateHelper;
     SetDefaultNetworkStateHelperExpectations();
     network_screen_->SetNetworkStateHelperForTest(mock_network_state_helper_);
   }
@@ skipping 185 matching lines @@
   // Wait for the enrollment screen.
   OobeScreenWaiter(OobeScreen::SCREEN_OOBE_ENROLLMENT)
       .WaitNoAssertCurrentScreen();
 
   // Reset the enrollment helper so there is no side effect with other tests.
   static_cast<EnrollmentScreen*>(wizard_controller->current_screen())
       ->enrollment_helper_.reset();
 }
 
 }  // namespace chromeos