Add ash SessionStateDelegate

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index 9face4f7a325d8e2f9a46f120c58692b0055f86e..a98c4b362a773f88d8c9a0fe551b8e626416ffac 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -26,6 +26,7 @@
 #include "ash/root_window_controller.h"
 #include "ash/rotator/screen_rotation.h"
 #include "ash/screenshot_delegate.h"
+#include "ash/session_state_delegate.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
@@ -101,7 +102,7 @@ void HandleCycleWindowLinear(CycleDirection direction) {
 
 #if defined(OS_CHROMEOS)
 bool HandleLock() {
-  Shell::GetInstance()->delegate()->LockScreen();
+  Shell::GetInstance()->session_state_delegate()->LockScreen();
   return true;
 }
 
@@ -427,16 +428,12 @@ bool AcceleratorController::IsReservedAccelerator(
 bool AcceleratorController::PerformAction(int action,
                                           const ui::Accelerator& accelerator) {
   ash::Shell* shell = ash::Shell::GetInstance();
-  bool at_login_screen = false;
-#if defined(OS_CHROMEOS)
-  at_login_screen = !shell->delegate()->IsSessionStarted();
-#endif
-  if (at_login_screen &&
+  if (!shell->session_state_delegate()->IsActiveUserSessionStarted() &&
       actions_allowed_at_login_screen_.find(action) ==
       actions_allowed_at_login_screen_.end()) {
     return false;
   }
-  if (shell->IsScreenLocked() &&
+  if (shell->session_state_delegate()->IsScreenLocked() &&
       actions_allowed_at_lock_screen_.find(action) ==
       actions_allowed_at_lock_screen_.end()) {
     return false;