ash: Use SessionController instead of SessionStateDelegate

ash/common/wallpaper/wallpaper_view.cc

Index: ash/common/wallpaper/wallpaper_view.cc
diff --git a/ash/common/wallpaper/wallpaper_view.cc b/ash/common/wallpaper/wallpaper_view.cc
index 415643782f20bbb4e7b51498078e18479d399da6..14345c09821915098ba94a3f190cb62e3429345b 100644
--- a/ash/common/wallpaper/wallpaper_view.cc
+++ b/ash/common/wallpaper/wallpaper_view.cc
@@ -4,7 +4,7 @@
 
 #include "ash/common/wallpaper/wallpaper_view.h"
 
-#include "ash/common/session/session_state_delegate.h"
+#include "ash/common/session/session_controller.h"
 #include "ash/common/wallpaper/wallpaper_controller.h"
 #include "ash/common/wallpaper/wallpaper_delegate.h"
 #include "ash/common/wallpaper/wallpaper_widget_controller.h"
@@ -222,7 +222,7 @@ views::Widget* CreateWallpaper(WmWindow* root_window, int container_id) {
   // 4. From an empty background, guest user logged in.
   if (wallpaper_delegate->ShouldShowInitialAnimation() ||
       root_window_controller->animating_wallpaper_widget_controller() ||
-      WmShell::Get()->GetSessionStateDelegate()->NumberOfLoggedInUsers()) {
+      WmShell::Get()->session_controller()->NumberOfLoggedInUsers()) {
     wallpaper_window->SetVisibilityAnimationTransition(::wm::ANIMATE_SHOW);
     int duration_override = wallpaper_delegate->GetAnimationDurationOverride();
     if (duration_override) {