To avoid the requirement of defining unnecessary gyp variables for

remoting/app_remoting_webapp_build.gypi

 # 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.
 
 {
   'includes': [
     'remoting_version.gypi',
     'remoting_locales.gypi',
     'remoting_options.gypi',
     'remoting_webapp_files.gypi',
     'app_remoting_webapp_files.gypi',
   ],
 
-  'variables': {
-    # The ar_service_environment variable is used to define the target
-    # environment for the app being built.
-    # The allowed values are dev, test, staging, and prod.
-    'conditions': [
-      ['buildtype == "Dev"', {
-        'ar_service_environment%': 'dev',
-      }, {  # buildtype != 'Dev'
-        # Non-dev build must have this set to 'prod'.
-        'ar_service_environment': 'prod',
-      }],
-    ],  # conditions
-  },  # end of variables
-
   'target_defaults': {
     'type': 'none',
 
     'dependencies': [
       # TODO(wez): Create proper resources for shared-stub and app-specific
       # stubs.
       '<(DEPTH)/remoting/remoting.gyp:remoting_resources',
     ],
 
     'locale_files': [
@@ skipping 193 matching lines @@
         # rather than using the extension id.
         # This is only done for Dev apps because the app-id for Release apps
         # *must* match the extension id.
         'variables': {
           'remoting_app_id': ['--appid', '>(_app_id)'],
         },
       }],
     ],  # conditions
   },  # target_defaults
 }