Revert 248271 "Add a minimum required version to the webapp mani..."

remoting/webapp/host_native_messaging.js

Index: remoting/webapp/host_native_messaging.js
===================================================================
--- remoting/webapp/host_native_messaging.js	(revision 248343)
+++ remoting/webapp/host_native_messaging.js	(working copy)
@@ -56,8 +56,8 @@
 
 /**
  * Sets up connection to the Native Messaging host process and exchanges
- * 'hello' messages. Invokes onDone on success and onError on failure (the
- * native messaging host is probably not installed).
+ * 'hello' messages. If Native Messaging is not available or the host
+ * process is not installed, this returns false to the callback.
  *
  * @param {function(): void} onDone Called after successful initialization.
  * @param {function(remoting.Error): void} onError Called if initialization
@@ -65,6 +65,22 @@
  * @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');