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

chrome/chrome_browser_chromeos.gypi

 # Copyright (c) 2012 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': {
     # These files lists are shared with the GN build.
     'browser_chromeos_sources': [
         # All .cc, .h, .m, and .mm files under browser/chromeos, except for tests
@@ skipping 1095 matching lines @@
         'safe_browsing_proto',        
         '../build/linux/system.gyp:dbus',
         '../chromeos/chromeos.gyp:chromeos',
         '../chromeos/chromeos.gyp:chromeos_test_support',
         '../chromeos/chromeos.gyp:cryptohome_proto',
         # browser_chromeos #includes signed_secret.pb.h directly.
         '../chromeos/chromeos.gyp:cryptohome_signkey_proto',
         # browser_chromeos #includes power_supply_properties.pb.h directly.
         '../chromeos/chromeos.gyp:power_manager_proto',
         '../chromeos/ime/input_method.gyp:gencode',
+        '../components/components.gyp:arc',
         '../components/components.gyp:certificate_reporting',
         '../components/components.gyp:cloud_policy_proto',
         '../components/components.gyp:drive',
         '../components/components.gyp:flags_ui',
         '../components/components.gyp:login',
         '../components/components.gyp:onc_component',
         '../components/components.gyp:ownership',
         '../components/components.gyp:pairing',
         '../components/components.gyp:policy',
         '../components/components.gyp:proxy_config',
@@ skipping 132 matching lines @@
         ['enable_basic_printing==1 or enable_print_preview==1', {
           'dependencies': [
             '../printing/printing.gyp:printing',
           ],
         }],
         ['use_ozone == 1', {
           'dependencies': [
             '../ui/ozone/ozone.gyp:ozone',
           ],
         }],
-        ['enable_arc == 1', {
-          'dependencies': [
-            '../components/components.gyp:arc',
-          ],
-        }],
       ],
     },
     {
       # GN version: //chrome/browser/chromeos:device_policy_proto
       # Protobuf compiler / generator for device settings protocol buffers.
       'target_name': 'device_policy_proto',
       'type': 'static_library',
       'sources': [
         'browser/chromeos/policy/proto/chrome_device_policy.proto',
         'browser/chromeos/policy/proto/install_attributes.proto',
@@ skipping 14 matching lines @@
         'browser/chromeos/attestation/attestation_signed_data.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/attestation',
         'proto_out_dir': 'chrome/browser/chromeos/attestation',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }