Bug 496455 - CryptoMeta__addUnwrappedKey always gets undefined new_pubkey

yield for PubKeys.get() when passed a string uri

--HG--
extra : rebase_source : d81bcbc7ba8fc45e83fb395dc93653f2749b3eed

services/sync/modules/base_records/crypto.js

@@ -196,7 +196,7 @@ CryptoMeta.prototype = {
 
     // get the new public key
     if (typeof new_pubkey == 'string')
-      new_pubkey = PubKeys.get(self.cb, new_pubkey);
+      new_pubkey = yield PubKeys.get(self.cb, new_pubkey);
 
     // each hash key is a relative uri, resolve those and
     // if we find the one we're about to add, remove it