[Chromoting] Set ar_service_environment for Official builds

remoting/app_remoting_webapp_build.gypi

Index: remoting/app_remoting_webapp_build.gypi
diff --git a/remoting/app_remoting_webapp_build.gypi b/remoting/app_remoting_webapp_build.gypi
index cf7e2af2d498b2dc257d8ddebbd1eb0b326e0bf1..325492579a33c76da9409036aeb66bc52bf58bf3 100644
--- a/remoting/app_remoting_webapp_build.gypi
+++ b/remoting/app_remoting_webapp_build.gypi
@@ -90,7 +90,7 @@
           '<@(ar_generated_html_files)',
           '<(ar_app_manifest_app)',
           '<(DEPTH)/remoting/<(ar_app_manifest_common)',
-       ],
+        ],
         'outputs': [
           '<(output_dir)',
           '<(zip_path)',
@@ -172,6 +172,10 @@
         'variables': {
           'remoting_app_id': ['--appid', '>(_app_id)'],
         },
+      }, {  # buildtype != 'Dev'
+        'variables': {
+          'ar_service_environment': 'prod',
+        },
       }],
     ],  # conditions
   },  # target_defaults