Use JSON.parse instead of deprecated goog.json.parse.

Thanks to [] shared libraries at Google now produce valid JSON which allows using JSON.parse. It is safer and faster than goog.json.parse which uses eval by default.

NOTE: All shared libraries producing JSON at Google were changed to produce valid JSON. However, if your code uses a custom way of producing JSON (not using the shared libraries) or if your code parses JSON generated a long time ago and stored, this CL might break you so please review with care.

Design doc: []

Tested:
    TAP --sample for global presubmit queue
    []

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=166454709

java/google/registry/ui/js/registrar/payment.js

@@ -285,7 +285,7 @@ registry.registrar.Payment.prototype.onMessage_ = function(e) {
   }
   var data;
   try {
-    data = goog.json.parse(msg.data);
+    data = /** @type {!Object} */ (JSON.parse(msg.data));
   } catch (ex) {
     // TODO(b/26876003): Figure out why it's possible that the Braintree iframe
     //                   is able to propagate messages up to our level.