Add ash SessionStateDelegate

ash/shelf/shelf_widget.cc

Index: ash/shelf/shelf_widget.cc
diff --git a/ash/shelf/shelf_widget.cc b/ash/shelf/shelf_widget.cc
index 755062249c43c6f3b917a8c732246f116379b0a3..1e2da78ffd72fbf3487437ccf3b66fea8dc5c091 100644
--- a/ash/shelf/shelf_widget.cc
+++ b/ash/shelf/shelf_widget.cc
@@ -10,10 +10,10 @@
 #include "ash/launcher/launcher_navigator.h"
 #include "ash/launcher/launcher_view.h"
 #include "ash/root_window_controller.h"
+#include "ash/session_state_delegate.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
-#include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/property_util.h"
 #include "ash/wm/status_area_layout_manager.h"
@@ -440,8 +440,10 @@ ShelfWidget::ShelfWidget(
 
   status_area_widget_ = new internal::StatusAreaWidget(status_container);
   status_area_widget_->CreateTrayViews();
-  if (Shell::GetInstance()->delegate()->IsSessionStarted())
+  if (Shell::GetInstance()->session_state_delegate()->
+          IsActiveUserSessionStarted()) {
     status_area_widget_->Show();
+  }
   Shell::GetInstance()->focus_cycler()->AddWidget(status_area_widget_);
 
   shelf_layout_manager_ = new internal::ShelfLayoutManager(this);
@@ -498,9 +500,8 @@ void ShelfWidget::CreateLauncher() {
     internal::RootWindowController::ForWindow(window_container_)->
         OnLauncherCreated();
 
-    ShellDelegate* delegate = shell->delegate();
-    if (delegate)
-      launcher_->SetVisible(delegate->IsSessionStarted());
+    launcher_->SetVisible(
+        shell->session_state_delegate()->IsActiveUserSessionStarted());
 
     Show();
   }