Mojo JS bindings: change arrow operator in bindings.js to the old style.

mojo/public/js/bindings.js

 // Copyright 2014 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("mojo/public/js/bindings", [
   "mojo/public/js/connection",
   "mojo/public/js/core",
   "mojo/public/js/interface_types",
 ], function(connection, core, types) {
 
@@ skipping 170 matching lines @@
   };
 
   // ---------------------------------------------------------------------------
 
   function BindingSetEntry(bindingSet, interfaceType, impl, requestOrHandle,
                            bindingId) {
     this.bindingSet_ = bindingSet;
     this.bindingId_ = bindingId;
     this.binding_ = new Binding(interfaceType, impl, requestOrHandle);
 
-    this.binding_.setConnectionErrorHandler(
-        () => this.bindingSet_.onConnectionError(bindingId));
+    this.binding_.setConnectionErrorHandler(function() {
+      this.bindingSet_.onConnectionError(bindingId);
+    }.bind(this));
   }
 
   BindingSetEntry.prototype.close = function() {
     this.binding_.close();
   };
 
   function BindingSet(interfaceType) {
     this.interfaceType_ = interfaceType;
     this.nextBindingId_ = 0;
     this.bindings_ = new Map();
@@ skipping 40 matching lines @@
   // TODO(yzshen): Remove the following exports.
   exports.EmptyProxy = connection.EmptyProxy;
   exports.EmptyStub = connection.EmptyStub;
   exports.ProxyBase = connection.ProxyBase;
   exports.ProxyBindings = connection.ProxyBindings;
   exports.StubBase = connection.StubBase;
   exports.StubBindings = connection.StubBindings;
 
   return exports;
 });