Put more files under the enable_service_discovery build flag.

chrome/chrome_browser_extensions.gypi

Index: chrome/chrome_browser_extensions.gypi
diff --git a/chrome/chrome_browser_extensions.gypi b/chrome/chrome_browser_extensions.gypi
index 7a790eb47dd37fc85bc309c27c1b3dc40ba91a80..f4c361a879f3c8ebea06aa4ff9886ff44b21d925 100644
--- a/chrome/chrome_browser_extensions.gypi
+++ b/chrome/chrome_browser_extensions.gypi
@@ -71,14 +71,16 @@
       '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',
@@ -1043,6 +1045,11 @@
             '<@(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',