Allow signin to continue even if sync is disabled by policy.

chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc

Index: chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
diff --git a/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc b/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
index 6e00ca14e4f8e10bd1531731f77db45273d6b4fd..0ac2fac22f2ee8680b89d32e432de96c3dcff016 100644
--- a/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
+++ b/chrome/browser/ui/webui/sync_promo/sync_promo_ui.cc
@@ -16,6 +16,8 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_info_cache.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/signin/signin_manager.h"
+#include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "chrome/browser/ui/webui/options/core_options_handler.h"
@@ -126,8 +128,13 @@ bool SyncPromoUI::ShouldShowSyncPromo(Profile* profile) {
     return false;
 
   // Honor the sync policies.
-  if (!profile->GetOriginalProfile()->IsSyncAccessible())
-    return false;
+  profile = profile->GetOriginalProfile();
+  if (!profile->IsSyncAccessible()) {
+    // Sync is disabled by policy - display the promo if the user is not signed
+    // in.
+    SigninManager* signin = SigninManagerFactory::GetForProfile(profile);
+    return signin->GetAuthenticatedUsername().empty();
+  }
 
   // If the user is already signed into sync then don't show the promo.
   ProfileSyncService* service =