Cleanup mojo-js tests.

mojo/public/js/connection_tests.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 define([
     "gin/test/expect",
     "mojo/public/js/bindings",
     "mojo/public/js/core",
     "mojo/public/interfaces/bindings/tests/sample_interfaces.mojom",
     "mojo/public/interfaces/bindings/tests/sample_service.mojom",
@@ skipping 115 matching lines @@
       throw Error("Expected echoString to fail.");
     }, function(error) {
       expect(error.message).toBe("Connection error: " + core.RESULT_UNKNOWN);
 
       return Promise.resolve();
     });
 
     return promise;
   }
 });