Set flag for wallpaper wait correctly now that we have parallel/postpone init types

chrome/browser/chromeos/login/webui_login_display_host.cc

Index: chrome/browser/chromeos/login/webui_login_display_host.cc
diff --git a/chrome/browser/chromeos/login/webui_login_display_host.cc b/chrome/browser/chromeos/login/webui_login_display_host.cc
index f244ac1b5f7ee202eb3f3d1ad1487a1953cade75..cef2871547ceae8ec0fa1750a6d509403d658380 100644
--- a/chrome/browser/chromeos/login/webui_login_display_host.cc
+++ b/chrome/browser/chromeos/login/webui_login_display_host.cc
@@ -209,6 +209,10 @@ void WebUILoginDisplayHost::Observe(
         ShowWebUI();
       else
         StartPostponedWebUI();
+      // StartWizard / StartSignInScreen could be called multiple times through
+      // the lifetime of host.
+      // Make sure that subsequent calls are not postponed.
+      waiting_for_wallpaper_load_ = false;
     }
     registrar_.Remove(this,
                       chrome::NOTIFICATION_WALLPAPER_ANIMATION_FINISHED,
@@ -319,10 +323,6 @@ void WebUILoginDisplayHost::StartPostponedWebUI() {
     return;
   }
 
-  // StartWizard / StartSignInScreen could be called multiple times through
-  // the lifetime of host. Make sure that subsequent calls are not postponed.
-  waiting_for_wallpaper_load_ = false;
-
   // Wallpaper has finished loading before StartWizard/StartSignInScreen has
   // been called. In general this should not happen.
   // Let go through normal code path when one of those will be called.