Make enable_service_discovery a chrome/ feature.

chrome/common/url_constants.cc

 // 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.
 
 #include "chrome/common/url_constants.h"
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "build/build_config.h"
@@ skipping 689 matching lines @@
 #endif
 #if !defined(DISABLE_NACL)
   kChromeUINaClHost,
 #endif
 #if defined(ENABLE_EXTENSIONS)
   kChromeUIExtensionsHost,
 #endif
 #if defined(ENABLE_PRINT_PREVIEW)
   kChromeUIPrintHost,
 #endif
-#if defined(ENABLE_SERVICE_DISCOVERY)
+#if BUILDFLAG(ENABLE_SERVICE_DISCOVERY)
   kChromeUIDevicesHost,
 #endif
 #if defined(ENABLE_WEBRTC)
   kChromeUIWebRtcLogsHost,
 #endif
 };
 const size_t kNumberOfChromeHostURLs = arraysize(kChromeHostURLs);
 
 const char* const kChromeDebugURLs[] = {
   content::kChromeUIBadCastCrashURL,
@@ skipping 70 matching lines @@
 #endif
 
 const char kChooserUsbOverviewURL[] =
     "https://support.google.com/chrome?p=webusb";
 
 #if defined(OS_CHROMEOS)
 const char kEolNotificationURL[] = "https://www.google.com/chromebook/older/";
 #endif
 
 }  // namespace chrome