sync: Add --enable-sync-sessions-v2 and necessary plumbing to use SessionsSyncManager.

chrome/browser/ui/webui/ntp/android/promo_handler.cc

Index: chrome/browser/ui/webui/ntp/android/promo_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/android/promo_handler.cc b/chrome/browser/ui/webui/ntp/android/promo_handler.cc
index 4c8ba25cccf8c5fbde4e0df9c0260ba5b0b618b4..d5a0bfd04afb9c48fafce0a131761541cc5c3d6b 100644
--- a/chrome/browser/ui/webui/ntp/android/promo_handler.cc
+++ b/chrome/browser/ui/webui/ntp/android/promo_handler.cc
@@ -16,8 +16,8 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/signin/signin_manager.h"
-#include "chrome/browser/sync/glue/session_model_associator.h"
 #include "chrome/browser/sync/glue/synced_session.h"
+#include "chrome/browser/sync/open_tabs_ui_delegate.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "chrome/browser/web_resource/notification_promo.h"
@@ -312,15 +312,15 @@ void PromoHandler::CheckDesktopSessions() {
     return;
 
   // Check if the sync has any open sessions.
-  browser_sync::SessionModelAssociator* associator =
-      service->GetSessionModelAssociator();
-  if (!associator)
+  browser_sync::OpenTabsUIDelegate* open_tabs =
+      service->GetOpenTabsUIDelegate();
+  if (!open_tabs)
     return;
 
   // Let's see if there are no desktop sessions.
   std::vector<const browser_sync::SyncedSession*> sessions;
   ListValue session_list;
-  if (!associator->GetAllForeignSessions(&sessions))
+  if (!open_tabs->GetAllForeignSessions(&sessions))
     return;
 
   for (size_t i = 0; i < sessions.size(); ++i) {