[Sync] Fix namespaces for the browser_sync component.

chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc

Index: chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
diff --git a/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc b/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
index c759bdfd51a109fdd97892744e0fca1d9f9a8f86..68f0fbf74e775d4af92f5eb0311bc7dfd6b22b47 100644
--- a/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
+++ b/chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.cc
@@ -711,8 +711,9 @@ void RecentTabsSubMenuModel::ClearLocalEntries() {
 sync_sessions::OpenTabsUIDelegate*
 RecentTabsSubMenuModel::GetOpenTabsUIDelegate() {
   if (!open_tabs_delegate_) {
-    ProfileSyncService* service = ProfileSyncServiceFactory::GetInstance()->
-        GetForProfile(browser_->profile());
+    browser_sync::ProfileSyncService* service =
+        ProfileSyncServiceFactory::GetInstance()->GetForProfile(
+            browser_->profile());
     // Only return the delegate if it exists and it is done syncing sessions.
     if (service && service->IsSyncActive())
       open_tabs_delegate_ = service->GetOpenTabsUIDelegate();