ash: Use SessionController instead of SessionStateDelegate

ash/common/session/session_controller_unittest.cc

Index: ash/common/session/session_controller_unittest.cc
diff --git a/ash/common/session/session_controller_unittest.cc b/ash/common/session/session_controller_unittest.cc
index d6a986a6833d412ffb68fd7bca53b327c9a78655..05881ee36a9c356195adf67301a8a8515c39ae09 100644
--- a/ash/common/session/session_controller_unittest.cc
+++ b/ash/common/session/session_controller_unittest.cc
@@ -126,9 +126,15 @@ TEST_F(SessionControllerTest, SimpleSessionInfo) {
 
   EXPECT_EQ(session_manager::kMaxmiumNumberOfUserSessions,
             controller()->GetMaximumNumberOfLoggedInUsers());
-  EXPECT_TRUE(controller()->CanLockScreen());
   EXPECT_TRUE(controller()->ShouldLockScreenAutomatically());
 
+  // Cannot lock screen when there is no active user session.

[James Cook, 2017/03/17 17:14:35]

nit: Put this in a separate test case.

[xiyuan, 2017/03/17 22:52:02]

Done.

+  EXPECT_FALSE(controller()->IsActiveUserSessionStarted());
+  EXPECT_FALSE(controller()->CanLockScreen());
+  UpdateSession(1u, "user1@test.com");
+  EXPECT_TRUE(controller()->IsActiveUserSessionStarted());
+  EXPECT_TRUE(controller()->CanLockScreen());
+
   info.can_lock_screen = false;
   SetSessionInfo(info);
   EXPECT_FALSE(controller()->CanLockScreen());