[Chromoting] Enable remoting webapp main.html GN build.

remoting/remoting_enable.gypi

 # Copyright 2015 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.
 
+# Keep in sync with remoting/remoting_enable.gni.
+
 {
   'variables': {
     'enable_remoting_host%': 0,
     'enable_me2me_host%': 0,
 
     'conditions': [
       ['OS=="win" or OS=="mac"', {
         'enable_remoting_host': 1,
         'enable_me2me_host': 1,
       }],
       ['OS=="linux" and chromeos==0 and use_x11==1', {
         'enable_remoting_host': 1,
         'enable_me2me_host': 1,
       }],
       ['OS=="linux" and chromeos==1', {
         'enable_remoting_host': 1,
       }],
     ],  # end of conditions
   },  # end of variables
 }