Migrate call sites LoginDisplayHostImpl::default_host to LoginDisplayHost.

chrome/browser/chromeos/login/oobe_browsertest.cc

 // Copyright (c) 2013 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 "base/command_line.h"
 #include "base/macros.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
 #include "chrome/browser/chromeos/login/test/oobe_base_test.h"
 #include "chrome/browser/chromeos/login/test/oobe_screen_waiter.h"
@@ skipping 24 matching lines @@
   ~OobeTest() override {}
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitch(switches::kOobeSkipPostLogin);
 
     OobeBaseTest::SetUpCommandLine(command_line);
   }
 
   void TearDownOnMainThread() override {
     // If the login display is still showing, exit gracefully.
-    if (LoginDisplayHostImpl::default_host()) {
+    if (LoginDisplayHost::default_host()) {
       base::MessageLoop::current()->PostTask(FROM_HERE,
                                              base::Bind(&chrome::AttemptExit));
       content::RunMessageLoop();
     }
 
     OobeBaseTest::TearDownOnMainThread();
   }
 
-  chromeos::WebUILoginDisplay* GetLoginDisplay() {
-    chromeos::ExistingUserController* controller =
-        chromeos::ExistingUserController::current_controller();
+  WebUILoginDisplay* GetLoginDisplay() {
+    ExistingUserController* controller =
+        ExistingUserController::current_controller();
     CHECK(controller);

[achuithb, 2016/01/22 22:37:08]

nit: drop check since line below crashes

[jdufault, 2016/01/22 23:04:15]

Done.

-    return static_cast<chromeos::WebUILoginDisplay*>(
-        controller->login_display());
+    return static_cast<WebUILoginDisplay*>(controller->login_display());
   }
 
   views::Widget* GetLoginWindowWidget() {
-    return static_cast<chromeos::LoginDisplayHostImpl*>(
-        chromeos::LoginDisplayHostImpl::default_host())
+    return static_cast<LoginDisplayHostImpl*>(LoginDisplayHost::default_host())
         ->login_window_for_test();
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(OobeTest);
 };
 
 IN_PROC_BROWSER_TEST_F(OobeTest, NewUser) {
   WaitForGaiaPageLoad();
 
@@ skipping 15 matching lines @@
   ui_controls::SendKeyPress(login_window,
                             ui::VKEY_E,
                             true,    // control
                             false,   // shift
                             true,    // alt
                             false);  // command
   OobeScreenWaiter(OobeDisplay::SCREEN_OOBE_ENROLLMENT).Wait();
 }
 
 }  // namespace chromeos