WORK IN PROGRESS.

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 1d41a8b6e5a3b83daff0a589c8d949693ae6140e..263e924e6776a502ed2ff67f2a3ef8e1bd437c83 100644
--- a/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
+++ b/chrome/browser/ui/webui/ntp/ntp_resource_cache.cc
@@ -483,6 +483,8 @@ 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)) {

[not at google - send to devlin, 2011/08/26 09:58:47]

I'm not sure what this is about but the CHECK on the line below gets triggered
without it, or at least, it was last week.  I'll look into it again when I get
the chance.

+      LOG(ERROR) << "Got unacknowledged settings sync something.  What???";
     } else {
       // Shouldn't be possible for any other types to be unacknowledged.
       CHECK(!unacknowledged.any());