Update libsignal-protocol v0.9.0

* Exposes crypto APIs.
* Move worker methods to libsigna.worker.
* Move ProvisioningCipher to libtextsecure.

js/background.js

@@ -33,7 +33,7 @@
     });
 
     // start a background worker for ecc
-    textsecure.protocol_wrapper.startWorker('/js/libsignal-protocol-worker.js');
+    textsecure.startWorker('/js/libsignal-protocol-worker.js');
 
     extension.onLaunched(function() {
         console.log('extension launched');