Migrate call sites LoginDisplayHostImpl::default_host to LoginDisplayHost.

chrome/browser/chromeos/system/device_disabling_browsertest.cc

Index: chrome/browser/chromeos/system/device_disabling_browsertest.cc
diff --git a/chrome/browser/chromeos/system/device_disabling_browsertest.cc b/chrome/browser/chromeos/system/device_disabling_browsertest.cc
index becfa4c622461ff458f2e5be2f7bceafadc96a07..924ed7476813df9dbe763232d00822440dbd527a 100644
--- a/chrome/browser/chromeos/system/device_disabling_browsertest.cc
+++ b/chrome/browser/chromeos/system/device_disabling_browsertest.cc
@@ -12,7 +12,7 @@
 #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"
@@ -175,8 +175,7 @@ IN_PROC_BROWSER_TEST_F(DeviceDisablingTest, DisableWithEphemeralUsers) {
   // 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);