Add a minimum required version to the webapp manifest to ensure that native messaging is supported.

remoting/webapp/host_native_messaging.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.
 
 /**
  * @fileoverview
  * Class to communicate with the Host components via Native Messaging.
  */
 
 'use strict';
@@ skipping 38 matching lines @@
  * @constructor
  */
 remoting.HostNativeMessaging.PendingReply = function(type, onDone, onError) {
   this.type = type;
   this.onDone = onDone;
   this.onError = onError;
 };
 
 /**
  * Sets up connection to the Native Messaging host process and exchanges
- * 'hello' messages. If Native Messaging is not available or the host
- * process is not installed, this returns false to the callback.
+ * 'hello' messages. Invokes onDone on success and onError on failure (the
+ * native messaging host is probably not installed).
  *
  * @param {function(): void} onDone Called after successful initialization.
  * @param {function(remoting.Error): void} onError Called if initialization
  *     failed.
  * @return {void} Nothing.
  */
 remoting.HostNativeMessaging.prototype.initialize = function(onDone, onError) {
-  if (!chrome.runtime.connectNative) {
-    console.log('Native Messaging API not available');
-    onError(remoting.Error.UNEXPECTED);
-    return;
-  }
-
-  // NativeMessaging API exists on Chrome 26.xxx but fails to notify
-  // onDisconnect in the case where the Host components are not installed. Need
-  // to blacklist these versions of Chrome.
-  var majorVersion = navigator.appVersion.match('Chrome/(\\d+)\.')[1];
-  if (!majorVersion || majorVersion <= 26) {
-    console.log('Native Messaging not supported on this version of Chrome');
-    onError(remoting.Error.UNEXPECTED);
-    return;
-  }
-
   try {
     this.port_ = chrome.runtime.connectNative(
         'com.google.chrome.remote_desktop');
     this.port_.onMessage.addListener(this.onIncomingMessage_.bind(this));
     this.port_.onDisconnect.addListener(this.onDisconnect_.bind(this));
     this.postMessage_({type: 'hello'}, onDone,
                       onError.bind(null, remoting.Error.UNEXPECTED));
   } catch (err) {
     console.log('Native Messaging initialization failed: ',
                 /** @type {*} */ (err));
@@ skipping 511 matching lines @@
  *     on error.
  * @return {void} Nothing.
  */
 remoting.HostNativeMessaging.prototype.getCredentialsFromAuthCode =
     function(authorizationCode, onDone, onError) {
   this.postMessage_({
     type: 'getCredentialsFromAuthCode',
     authorizationCode: authorizationCode
   }, onDone, onError);
 };