Migrate call sites LoginDisplayHostImpl::default_host to LoginDisplayHost.

chrome/browser/chromeos/system/device_disabling_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 <string>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "chrome/browser/chromeos/login/test/oobe_base_test.h"
 #include "chrome/browser/chromeos/login/test/oobe_screen_waiter.h"
-#include "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
+#include "chrome/browser/chromeos/login/ui/login_display_host.h"
 #include "chrome/browser/chromeos/login/ui/oobe_display.h"
 #include "chrome/browser/chromeos/login/ui/webui_login_view.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 #include "chrome/browser/chromeos/policy/device_policy_builder.h"
 #include "chrome/browser/chromeos/policy/device_policy_cros_browser_test.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/ui/webui/chromeos/login/network_state_informer.h"
 #include "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
@@ skipping 142 matching lines @@
   ASSERT_TRUE(wizard_controller);
   wizard_controller->SkipToLoginForTesting(LoginScreenContext());
   OobeScreenWaiter(OobeDisplay::SCREEN_GAIA_SIGNIN).Wait();
 
   // Mark the device as disabled and wait until cros settings update.
   MarkDisabledAndWaitForPolicyFetch();
 
   // When the ephemeral users policy is enabled, Chrome OS removes any non-owner
   // cryptohomes on startup. At the end of that process, JavaScript attempts to
   // show the login screen. Simulate this.
-  const LoginDisplayHostImpl* const host =
-      static_cast<LoginDisplayHostImpl*>(LoginDisplayHostImpl::default_host());
+  const LoginDisplayHost* const host = LoginDisplayHost::default_host();

[achuithb, 2016/01/21 23:14:31]

Maybe drop all the consts here?

[jdufault, 2016/01/22 21:14:11]

Done.

   ASSERT_TRUE(host);
   WebUILoginView* const webui_login_view = host->GetWebUILoginView();
   ASSERT_TRUE(webui_login_view);
   content::WebContents* const web_contents = webui_login_view->GetWebContents();
   ASSERT_TRUE(web_contents);
   ASSERT_TRUE(content::ExecuteScript(web_contents,
                                      "Oobe.showAddUserForTesting();"));
 
   // The login profile is scrubbed before attempting to show the login screen.
   // Wait for the scrubbing to finish.
@@ skipping 22 matching lines @@
   network_state_informer->RemoveObserver(this);
   base::RunLoop().RunUntilIdle();
 
   // Verify that the offline error screen was not shown and the device disabled
   // screen is still being shown instead.
   EXPECT_EQ(OobeUI::kScreenDeviceDisabled, GetCurrentScreenName(web_contents));
 }
 
 }  // namespace system
 }  // namespace chromeos