chromeos: Fix shelf appearing at login screen under mash

ash/root_window_controller_unittest.cc

Index: ash/root_window_controller_unittest.cc
diff --git a/ash/root_window_controller_unittest.cc b/ash/root_window_controller_unittest.cc
index 43fd9ee96253bcc58ce340e19cc51ee898819ff1..94d56b2539d917f51db199cdf41950a8298654d8 100644
--- a/ash/root_window_controller_unittest.cc
+++ b/ash/root_window_controller_unittest.cc
@@ -976,7 +976,7 @@ TEST_F(VirtualKeyboardRootWindowControllerTest,
   aura::WindowTracker tracker;
   tracker.Add(keyboard_container);
   // Mock a login user profile change to reinitialize the keyboard.
-  Shell::GetInstance()->OnLoginUserProfilePrepared();
+  WmShell::Get()->OnUserSessionStateActive();

[msw, 2016/12/16 16:26:20]

This is okay, but it'd be even better if we could trigger the keyboard code
directly, unless we're testing its relation to the SessionState.

[James Cook, 2016/12/20 04:02:43]

Done.

   // keyboard_container should no longer be present.
   EXPECT_FALSE(tracker.Contains(keyboard_container));
 }
@@ -1010,7 +1010,7 @@ TEST_F(VirtualKeyboardRootWindowControllerTest, RestoreWorkspaceAfterLogin) {
   }
 
   // Mock a login user profile change to reinitialize the keyboard.
-  Shell::GetInstance()->OnLoginUserProfilePrepared();
+  WmShell::Get()->OnUserSessionStateActive();
   EXPECT_EQ(display::Screen::GetScreen()->GetPrimaryDisplay().work_area(),
             before);
 }