Revert of Mojo JS bindings: switch most usage of "connection"/"router" module to "bindings".

ios/web/test/data/mojo_test.js

 // Copyright 2016 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.
 
 // This module provides the test page for WebUIMojoTest. Once the page is
 // loaded it sends "syn" message to the native code. Once page receives "ack"
 // from the native code, the page then sends "fin". Test succeeds only when
 // "fin" is received by the native page. Refer to
 // ios/web/webui/web_ui_mojo_inttest.mm for testing code.
 
 /** @return {!Promise} */
 function getBrowserProxy() {
   return new Promise(function(resolve, reject) {
     define([
       'mojo/public/js/bindings',
+      'mojo/public/js/connection',
       'ios/web/test/mojo_test.mojom',
       'content/public/renderer/frame_interfaces',
-    ], function(bindings, mojom, frameInterfaces) {
+    ], function(bindings, connection, mojom, frameInterfaces) {
       var pageImpl, browserProxy;
 
       /** @constructor */
       function TestPageImpl() {
         this.binding = new bindings.Binding(mojom.TestPage, this);
       }
 
       TestPageImpl.prototype = {
         /** @override */
         handleNativeMessage: function(result) {
           if (result.message == 'ack') {
             // Native code has replied with "ack", send "fin" to complete the
             // test.
             browserProxy.handleJsMessage('fin');
           }
         },
       };
 
-      browserProxy = new mojom.TestUIHandlerMojoPtr(
-          frameInterfaces.getInterface(mojom.TestUIHandlerMojo.name));
+      browserProxy = connection.bindHandleToProxy(
+          frameInterfaces.getInterface(mojom.TestUIHandlerMojo.name),
+          mojom.TestUIHandlerMojo);
       pageImpl = new TestPageImpl();
 
       browserProxy.setClientPage(pageImpl.binding.createInterfacePtrAndBind());
       resolve(browserProxy);
     });
   });
 }
 
 /**
  * @return {!Promise} Fires when DOMContentLoaded event is received.
  */
 function whenDomContentLoaded() {
   return new Promise(function(resolve, reject) {
     document.addEventListener('DOMContentLoaded', resolve);
   });
 }
 
 function main() {
   Promise.all([
     getBrowserProxy(), whenDomContentLoaded()
   ]).then(function([browserProxy]) {
     // Send "syn" so native code should reply with "ack".
     browserProxy.handleJsMessage('syn');
   });
 }
 main();