Add ash SessionStateDelegate

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 7b809cb0f826ca6e76cfd9f135549ea51f5c7986..9356cfc05611695753a167f654f27729ed3c7d58 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -28,6 +28,7 @@
 #include "ash/magnifier/partial_magnification_controller.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_ash.h"
+#include "ash/session_state_delegate.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell_delegate.h"
@@ -559,6 +560,8 @@ void Shell::Init() {
   // StatusAreaWidget uses Shell's CapsLockDelegate.
   caps_lock_delegate_.reset(delegate_->CreateCapsLockDelegate());
 
+  session_state_delegate_.reset(delegate_->CreateSessionStateDelegate());
+
   if (!command_line->HasSwitch(views::corewm::switches::kNoDropShadows)) {
     resize_shadow_controller_.reset(new internal::ResizeShadowController());
     shadow_controller_.reset(
@@ -602,11 +605,11 @@ void Shell::Init() {
 }
 
 void Shell::ShowContextMenu(const gfx::Point& location_in_screen) {
-  // No context menus if user have not logged in.
-  if (!delegate_->IsUserLoggedIn())
+  // No context menus if there is no session with an active user.
+  if (!session_state_delegate_->HasActiveUser())
     return;
   // No context menus when screen is locked.
-  if (IsScreenLocked())
+  if (session_state_delegate_->IsScreenLocked())
     return;
 
   aura::RootWindow* root =
@@ -640,14 +643,6 @@ aura::Window* Shell::GetAppListWindow() {
   return app_list_controller_.get() ? app_list_controller_->GetWindow() : NULL;
 }
 
-bool Shell::CanLockScreen() {
-  return delegate_->CanLockScreen();
-}
-
-bool Shell::IsScreenLocked() const {
-  return delegate_->IsScreenLocked();
-}
-
 bool Shell::IsSystemModalWindowOpen() const {
   if (simulate_modal_window_open_for_testing_)
     return true;