Move enable_webrtc to a buildflag header.

chrome/common/url_constants.cc

Index: chrome/common/url_constants.cc
diff --git a/chrome/common/url_constants.cc b/chrome/common/url_constants.cc
index 78aad6657a58b11b6ae0a31fc0065cd58c1b51f5..66f61c0620df0023e6c1abb140662f562de1d2f5 100644
--- a/chrome/common/url_constants.cc
+++ b/chrome/common/url_constants.cc
@@ -11,6 +11,7 @@
 #include "chrome/common/features.h"
 #include "content/public/common/url_constants.h"
 #include "extensions/features/features.h"
+#include "media/media_features.h"
 #include "printing/features/features.h"
 #include "url/url_util.h"
 
@@ -144,7 +145,7 @@ const char kChromeUITabModalConfirmDialogURL[] =
     "chrome://tab-modal-confirm-dialog/";
 #endif
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 const char kChromeUIWebRtcLogsURL[] = "chrome://webrtc-logs/";
 #endif
 
@@ -335,7 +336,7 @@ const char kChromeUIMetroFlowHost[] = "make-metro";
 const char kChromeUITabModalConfirmDialogHost[] = "tab-modal-confirm-dialog";
 #endif
 
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
 const char kChromeUIWebRtcLogsHost[] = "webrtc-logs";
 #endif
 
@@ -724,7 +725,7 @@ const char* const kChromeHostURLs[] = {
 #if BUILDFLAG(ENABLE_SERVICE_DISCOVERY)
     kChromeUIDevicesHost,
 #endif
-#if defined(ENABLE_WEBRTC)
+#if BUILDFLAG(ENABLE_WEBRTC)
     kChromeUIWebRtcLogsHost,
 #endif
 };