Make enable_service_discovery a chrome/ feature.

chrome/browser/ui/webui/options/browser_options_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_OPTIONS_BROWSER_OPTIONS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_BROWSER_OPTIONS_HANDLER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_attributes_storage.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 #include "chrome/browser/ui/zoom/chrome_zoom_level_prefs.h"
+#include "chrome/common/features.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "components/prefs/pref_member.h"
 #include "components/search_engines/template_url_service_observer.h"
 #include "components/signin/core/browser/signin_manager_base.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "components/sync/driver/sync_service_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "extensions/browser/extension_registry_observer.h"
 #include "google_apis/gaia/google_service_auth_error.h"
@@ skipping 240 matching lines @@
   // an appropriate dialog for configuring proxy settings.
   void ShowNetworkProxySettings(const base::ListValue* args);
 #endif
 
 #if !defined(USE_NSS_CERTS)
   // Callback for the "showManageSSLCertificates" message. This will invoke
   // an appropriate certificate management action based on the platform.
   void ShowManageSSLCertificates(const base::ListValue* args);
 #endif
 
-#if defined(ENABLE_SERVICE_DISCOVERY)
+#if BUILDFLAG(ENABLE_SERVICE_DISCOVERY)
   void ShowCloudPrintDevicesPage(const base::ListValue* args);
 #endif
 
 #if defined(ENABLE_PRINT_PREVIEW)
   // Register localized values used by Cloud Print
   void RegisterCloudPrintValues(base::DictionaryValue* values);
 #endif
 
   // Check if hotword is available. If it is, tell the javascript to show
   // the hotword section of the settings page.
@@ skipping 136 matching lines @@
 
   // Used to get WeakPtr to self for use on the UI thread.
   base::WeakPtrFactory<BrowserOptionsHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserOptionsHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_BROWSER_OPTIONS_HANDLER_H_