Put more files under the enable_service_discovery build flag.

chrome/chrome_browser_extensions.gypi

 # 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': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/cast_devices_private/cast_devices_private_api.cc',
       'browser/extensions/api/cast_devices_private/cast_devices_private_api.h',
       'browser/extensions/api/certificate_provider/certificate_provider_api.cc',
@@ skipping 53 matching lines @@
       'browser/extensions/api/image_writer_private/removable_storage_provider_linux.cc',
       'browser/extensions/api/messaging/native_message_process_host.cc',
       'browser/extensions/api/messaging/native_message_process_host.h',
       'browser/extensions/api/messaging/native_process_launcher.cc',
       'browser/extensions/api/messaging/native_process_launcher.h',
       'browser/extensions/api/messaging/native_process_launcher_android.cc',
       'browser/extensions/api/messaging/native_process_launcher_posix.cc',
       'browser/extensions/api/messaging/native_process_launcher_win.cc',
     ],
     'chrome_browser_extensions_non_android_sources': [
+      'browser/extensions/api/launcher_page/launcher_page_api.cc',
+      'browser/extensions/api/launcher_page/launcher_page_api.h',
+    ],
+    'chrome_browser_extensions_service_discovery_sources': [
       'browser/extensions/api/gcd_private/gcd_private_api.cc',
       'browser/extensions/api/gcd_private/gcd_private_api.h',
       'browser/extensions/api/gcd_private/privet_v3_context_getter.cc',
       'browser/extensions/api/gcd_private/privet_v3_context_getter.h',
       'browser/extensions/api/gcd_private/privet_v3_session.cc',
       'browser/extensions/api/gcd_private/privet_v3_session.h',
-      'browser/extensions/api/launcher_page/launcher_page_api.cc',
-      'browser/extensions/api/launcher_page/launcher_page_api.h',
       'browser/extensions/api/mdns/dns_sd_delegate.cc',
       'browser/extensions/api/mdns/dns_sd_delegate.h',
       'browser/extensions/api/mdns/dns_sd_device_lister.cc',
       'browser/extensions/api/mdns/dns_sd_device_lister.h',
       'browser/extensions/api/mdns/dns_sd_registry.cc',
       'browser/extensions/api/mdns/dns_sd_registry.h',
       'browser/extensions/api/mdns/mdns_api.cc',
       'browser/extensions/api/mdns/mdns_api.h',
     ],
     'chrome_browser_extensions_enabled_sources': [
@@ skipping 944 matching lines @@
             'browser/extensions/default_apps.cc',
             'browser/extensions/default_apps.h',
             '<@(chrome_browser_extensions_non_chromeos_sources)',
           ],
         }],
         ['OS!="android"', {
           'sources': [
             '<@(chrome_browser_extensions_non_android_sources)',
           ],
         }],
+        ['enable_service_discovery==1', {
+          'sources': [
+            '<@(chrome_browser_extensions_service_discovery_sources)',
+          ],
+        }],
         ['use_ash==1', {
           'sources': [
             'browser/extensions/api/tabs/ash_panel_contents.cc',
             'browser/extensions/api/tabs/ash_panel_contents.h',
           ],
         }],
         ['use_aura==1', {
           'dependencies': [
             '../ui/keyboard/keyboard.gyp:keyboard',
             '../ui/keyboard/keyboard.gyp:keyboard_with_content',
@@ skipping 103 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }