Add ash SessionStateDelegate

ash/wm/power_button_controller.cc

Index: ash/wm/power_button_controller.cc
diff --git a/ash/wm/power_button_controller.cc b/ash/wm/power_button_controller.cc
index 9359b8a2bc5fb2a8bb06d2c42a842c699be6aadb..685060806036a8a0ed30dc89830fa437ce0299d4 100644
--- a/ash/wm/power_button_controller.cc
+++ b/ash/wm/power_button_controller.cc
@@ -5,8 +5,8 @@
 #include "ash/wm/power_button_controller.h"
 
 #include "ash/ash_switches.h"
+#include "ash/session_state_delegate.h"
 #include "ash/shell.h"
-#include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/session_state_animator.h"
 #include "ash/wm/session_state_controller.h"
@@ -45,13 +45,15 @@ void PowerButtonController::OnPowerButtonEvent(
   if (screen_is_off_)
     return;
 
-  Shell* shell = Shell::GetInstance();
+  const SessionStateDelegate* session_state_delegate =
+      Shell::GetInstance()->session_state_delegate();
   if (has_legacy_power_button_) {
     // If power button releases won't get reported correctly because we're not
     // running on official hardware, just lock the screen or shut down
     // immediately.
     if (down) {
-      if (shell->CanLockScreen() && !shell->IsScreenLocked() &&
+      if (session_state_delegate->CanLockScreen() &&
+          !session_state_delegate->IsScreenLocked() &&
           !controller_->LockRequested()) {
         controller_->StartLockAnimationAndLockImmediately();
       } else {
@@ -64,10 +66,12 @@ void PowerButtonController::OnPowerButtonEvent(
       if (controller_->LockRequested())
         return;
 
-      if (shell->CanLockScreen() && !shell->IsScreenLocked())
+      if (session_state_delegate->CanLockScreen() &&
+          !session_state_delegate->IsScreenLocked()) {
         controller_->StartLockAnimation(true);
-      else
+      } else {
         controller_->StartShutdownAnimation();
+      }
     } else {  // Button is up.
       if (controller_->CanCancelLockAnimation())
         controller_->CancelLockAnimation();
@@ -81,9 +85,12 @@ void PowerButtonController::OnLockButtonEvent(
     bool down, const base::TimeTicks& timestamp) {
   lock_button_down_ = down;
 
-  Shell* shell = Shell::GetInstance();
-  if (!shell->CanLockScreen() || shell->IsScreenLocked() ||
-      controller_->LockRequested() || controller_->ShutdownRequested()) {
+  const SessionStateDelegate* session_state_delegate =
+      Shell::GetInstance()->session_state_delegate();
+  if (!session_state_delegate->CanLockScreen() ||
+      session_state_delegate->IsScreenLocked() ||
+      controller_->LockRequested() ||
+      controller_->ShutdownRequested()) {
     return;
   }