ash: Use SessionController instead of SessionStateDelegate

ash/system/chromeos/power/tablet_power_button_controller.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/system/chromeos/power/tablet_power_button_controller.h"
 
 #include "ash/common/accessibility_delegate.h"
-#include "ash/common/session/session_state_delegate.h"
+#include "ash/common/session/session_controller.h"
 #include "ash/common/shell_delegate.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "ash/wm/lock_state_controller.h"
 #include "base/time/default_tick_clock.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "ui/events/devices/input_device_manager.h"
 #include "ui/events/devices/stylus_state.h"
 #include "ui/events/event.h"
@@ skipping 226 matching lines @@
                                          : kShutdownWhenScreenOnTimeoutMs);
   shutdown_timer_.Start(FROM_HERE, timeout, this,
                         &TabletPowerButtonController::OnShutdownTimeout);
 }
 
 void TabletPowerButtonController::OnShutdownTimeout() {
   controller_->StartShutdownAnimation();
 }
 
 void TabletPowerButtonController::LockScreenIfRequired() {
-  SessionStateDelegate* session_state_delegate =
-      WmShell::Get()->GetSessionStateDelegate();
-  if (session_state_delegate->ShouldLockScreenAutomatically() &&
-      session_state_delegate->CanLockScreen() &&
-      !session_state_delegate->IsUserSessionBlocked() &&
+  SessionController* session_controller = WmShell::Get()->session_controller();
+  if (session_controller->ShouldLockScreenAutomatically() &&
+      session_controller->CanLockScreen() &&
+      !session_controller->IsUserSessionBlocked() &&
       !controller_->LockRequested()) {
-    session_state_delegate->LockScreen();
+    session_controller->LockScreen();
   }
 }
 
 }  // namespace ash