ash: Use SessionController instead of SessionStateDelegate

chrome/browser/chromeos/login/lock/screen_locker_browsertest.cc

Index: chrome/browser/chromeos/login/lock/screen_locker_browsertest.cc
diff --git a/chrome/browser/chromeos/login/lock/screen_locker_browsertest.cc b/chrome/browser/chromeos/login/lock/screen_locker_browsertest.cc
index cb42e44bf25be2cc971a572f919635d931b70018..a8b9ef79df6c8f701accb464898169b4417d616b 100644
--- a/chrome/browser/chromeos/login/lock/screen_locker_browsertest.cc
+++ b/chrome/browser/chromeos/login/lock/screen_locker_browsertest.cc
@@ -236,6 +236,10 @@ IN_PROC_BROWSER_TEST_F(ScreenLockerTest, TestFullscreenExit) {
     EXPECT_FALSE(browser_window->IsFullscreen());
   }
 
+  // Browser window should be activated after screen locker is gone. Otherwise,

[James Cook, 2017/03/17 17:14:36]

Thanks for adding comments like this. They are really helpful when reading the
tests.

+  // the rest of the test would fail.
+  ASSERT_EQ(window_state, ash::wm::GetActiveWindowState());
+
   // 2) If the active browser window is in fullscreen and the fullscreen window
   // has all of the pixels, locking the screen should exit fullscreen. The
   // fullscreen window has all of the pixels when in tab fullscreen.