arc-bridge: Enable ARC with a command-line flag

components/components.gyp

 # Copyright (c) 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.
 
 {
   'variables': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 131 matching lines @@
       'includes': [
         'audio_modem.gypi',
         'copresence.gypi',
         'feedback.gypi',
         'proximity_auth.gypi',
         'storage_monitor.gypi',
       ]
     }],
     ['chromeos == 1', {
       'includes': [
+        'arc.gypi',
         'pairing.gypi',
         'timers.gypi',
         'wifi_sync.gypi',
       ],
     }],
-    ['chromeos == 1 and enable_arc == 1', {
-      'includes': [
-        'arc.gypi',
-      ],
-    }],
     ['OS == "win" or OS == "mac"', {
       'includes': [
         'wifi.gypi',
       ],
     }],
     ['OS == "win"', {
       'includes': [
         'browser_watcher.gypi',
       ],
     }],
@@ skipping 30 matching lines @@
         'rlz.gypi',
       ],
     }],
     ['use_ash==1', {
       'includes': [
         'exo.gypi',
       ],
     }],
   ],
 }