Remove TopSites notification in favor of Observers

chrome/browser/history/chrome_history_client_factory.cc

Index: chrome/browser/history/chrome_history_client_factory.cc
diff --git a/chrome/browser/history/chrome_history_client_factory.cc b/chrome/browser/history/chrome_history_client_factory.cc
index 10c8618e91d43199f6dfdbdad3bdc4c4afafadbb..23ec9bd742e9816c02cee9d981a8f1a266edeb80 100644
--- a/chrome/browser/history/chrome_history_client_factory.cc
+++ b/chrome/browser/history/chrome_history_client_factory.cc
@@ -43,9 +43,7 @@ ChromeHistoryClientFactory::~ChromeHistoryClientFactory() {
 KeyedService* ChromeHistoryClientFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   Profile* profile = static_cast<Profile*>(context);
-  return new ChromeHistoryClient(BookmarkModelFactory::GetForProfile(profile),
-                                 profile,
-                                 profile->GetTopSites());
+  return new ChromeHistoryClient(BookmarkModelFactory::GetForProfile(profile));
 }
 
 content::BrowserContext* ChromeHistoryClientFactory::GetBrowserContextToUse(