Add callback list to PrefModelAssociator after sync data is loaded

ios/chrome/browser/content_settings/host_content_settings_map_factory.cc

Index: ios/chrome/browser/content_settings/host_content_settings_map_factory.cc
diff --git a/ios/chrome/browser/content_settings/host_content_settings_map_factory.cc b/ios/chrome/browser/content_settings/host_content_settings_map_factory.cc
index e6faf69a0000dce8d0efafdbfb15672ff67c34cd..369669ace4070aefe9168cfbb86a90996363a2b8 100644
--- a/ios/chrome/browser/content_settings/host_content_settings_map_factory.cc
+++ b/ios/chrome/browser/content_settings/host_content_settings_map_factory.cc
@@ -44,7 +44,7 @@ HostContentSettingsMapFactory::BuildServiceInstanceFor(
   }
   return make_scoped_refptr(new HostContentSettingsMap(
       browser_state->GetPrefs(), browser_state->IsOffTheRecord(),
-      false /* guest_profile */));
+      false /* guest_profile */, nullptr /* PrefServiceSyncable* */));

[raymes, 2016/06/29 03:50:01]

nit: same here

[lshang, 2016/06/30 05:03:36]

Same as above, don't need to address this after we change to not pass in it.

 }
 
 web::BrowserState* HostContentSettingsMapFactory::GetBrowserStateToUse(