Move enable_webrtc to a buildflag header.

chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc

Index: chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
diff --git a/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc b/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
index 3e57844e9d87097757c5a233cac6dc640e7dd6ff..8a1544aee6969f6cd932373e48226f38a8234aba 100644
--- a/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
+++ b/chrome/browser/ui/webui/chrome_web_ui_controller_factory.cc
@@ -79,6 +79,7 @@
 #include "content/public/common/content_client.h"
 #include "content/public/common/url_utils.h"
 #include "extensions/features/features.h"
+#include "media/media_features.h"
 #include "ppapi/features/features.h"
 #include "printing/features/features.h"
 #include "ui/gfx/favicon_size.h"
@@ -89,7 +90,7 @@
 #include "chrome/browser/ui/webui/nacl_ui.h"
 #endif
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 #include "chrome/browser/ui/webui/media/webrtc_logs_ui.h"
 #endif
 
@@ -599,7 +600,7 @@ WebUIFactoryFunction GetWebUIFactoryFunction(WebUI* web_ui,
     return &NewWebUI<LocalDiscoveryUI>;
   }
 #endif
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
   if (url.host_piece() == chrome::kChromeUIWebRtcLogsHost)
     return &NewWebUI<WebRtcLogsUI>;
 #endif