Enable sync for the settings from the Extension Settings API.

chrome/browser/ui/webui/ntp/ntp_resource_cache.cc

Index: chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
diff --git a/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc b/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
index c163df5712419a293fdf0f42e5a6d86a3959cfd3..5e5b30085a178c1bc16f8f3ea058a98937bb507c 100644
--- a/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
+++ b/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
@@ -485,6 +485,8 @@ string16 NTPResourceCache::GetSyncTypeMessage() {
       return l10n_util::GetStringUTF16(IDS_SYNC_ADDED_SESSIONS);
     } else if (unacknowledged.test(syncable::TYPED_URLS)) {
       return l10n_util::GetStringUTF16(IDS_SYNC_ADDED_TYPED_URLS);
+    } else if (unacknowledged.test(syncable::EXTENSION_SETTINGS)) {
+      LOG(ERROR) << "Unacknowledged extension settings.  TODO(kalman): what?";

[not at google - send to devlin, 2011/08/29 09:07:45]

TODO(kalman) indeed.  I presume something more than this will need to be done.

     } else {
       // Shouldn't be possible for any other types to be unacknowledged.
       CHECK(!unacknowledged.any());