ash: Use SessionController instead of SessionStateDelegate

ash/shell/lock_view.cc

Index: ash/shell/lock_view.cc
diff --git a/ash/shell/lock_view.cc b/ash/shell/lock_view.cc
index eb333a7fa9b77df97cee43c5782fa6dd12635cfa..9d39c0d904afe3026f932684f3f68520d7b3971c 100644
--- a/ash/shell/lock_view.cc
+++ b/ash/shell/lock_view.cc
@@ -2,11 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/common/session/session_state_delegate.h"
+#include "ash/common/session/session_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shell.h"
 #include "ash/shell/example_factory.h"
+#include "ash/shell/example_session_controller_client.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
@@ -62,7 +63,7 @@ class LockView : public views::WidgetDelegateView,
 
   // Overridden from views::WidgetDelegateView:
   void WindowClosing() override {
-    WmShell::Get()->GetSessionStateDelegate()->UnlockScreen();
+    ExampleSessionControllerClient::Get()->UnlockScreen();
   }
 
   // Overridden from views::ButtonListener: