SuggestionsService: implement SyncServiceObserver

chrome/browser/search/instant_service_factory.cc

Index: chrome/browser/search/instant_service_factory.cc
diff --git a/chrome/browser/search/instant_service_factory.cc b/chrome/browser/search/instant_service_factory.cc
index efd98a97a18cbe627748281784d9a14e9ba8277b..6cc76f32869dc70cb95d3083d820adbc29f33ec6 100644
--- a/chrome/browser/search/instant_service_factory.cc
+++ b/chrome/browser/search/instant_service_factory.cc
@@ -8,6 +8,7 @@
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/instant_service.h"
+#include "chrome/browser/search/suggestions/suggestions_service_factory.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ -31,6 +32,7 @@ InstantServiceFactory::InstantServiceFactory()
     : BrowserContextKeyedServiceFactory(
         "InstantService",
         BrowserContextDependencyManager::GetInstance()) {
+  DependsOn(suggestions::SuggestionsServiceFactory::GetInstance());
   DependsOn(TemplateURLServiceFactory::GetInstance());
 #if defined(ENABLE_THEMES)
   DependsOn(ThemeServiceFactory::GetInstance());