[Sync] Refactor non-frontend DTC to handle new API properly.

chrome/browser/search_engines/template_url_service.h

Index: chrome/browser/search_engines/template_url_service.h
diff --git a/chrome/browser/search_engines/template_url_service.h b/chrome/browser/search_engines/template_url_service.h
index 9cc391818a403c218ab586d4be838fedffedbc98..d46291e43d160102416c649f42d2200490339d3a 100644
--- a/chrome/browser/search_engines/template_url_service.h
+++ b/chrome/browser/search_engines/template_url_service.h
@@ -13,6 +13,7 @@
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/search_engines/search_host_to_urls_map.h"
@@ -62,7 +63,8 @@ struct URLVisitedDetails;
 class TemplateURLService : public WebDataServiceConsumer,
                            public ProfileKeyedService,
                            public NotificationObserver,
-                           public SyncableService {
+                           public SyncableService,
+                           public base::SupportsWeakPtr<TemplateURLService> {
  public:
   typedef std::map<std::string, std::string> QueryTerms;
   typedef std::vector<const TemplateURL*> TemplateURLVector;