disable the extension test until the test can support code in ES6 modules

See #713 for the blocking issue.

Author: smalls

shell/app-shell/elements/test/fake-database-test.js

@@ -5,6 +5,8 @@
 // subject to an additional IP rights grant found at
 // http://polymer.github.io/PATENTS.txt
 
+const assert = chai.assert;
+
 afterEach(function() {
   db.reset();
 });

shell/test/index.test.html

@@ -18,8 +18,10 @@
 <script src="../node_modules/mocha/mocha.js"></script>
 <script>mocha.setup('bdd')</script>
 
+<!-- TODO(smalls) fix this up with ES6 modules
 <script src="../apps/chrome-extension/data-processing.js"></script>
 <script src="../apps/chrome-extension/test/data-processing-test.js"></script>
+-->
 
 <script src="../app-shell/elements/test/fake-database.js"></script>
 <script src="../app-shell/elements/test/fake-database-test.js"></script>