Do not build webrtc-internals when ENABLE_WEBRTC is false.

content/browser/webui/content_web_ui_controller_factory.cc

Index: content/browser/webui/content_web_ui_controller_factory.cc
diff --git a/content/browser/webui/content_web_ui_controller_factory.cc b/content/browser/webui/content_web_ui_controller_factory.cc
index 6b7b760e8d5ec624ea37229ef6625c11d1deda9b..7a9263111f395e7b593854366e3c836851ec4fac 100644
--- a/content/browser/webui/content_web_ui_controller_factory.cc
+++ b/content/browser/webui/content_web_ui_controller_factory.cc
@@ -8,7 +8,6 @@
 #include "content/browser/gpu/gpu_internals_ui.h"
 #include "content/browser/indexed_db/indexed_db_internals_ui.h"
 #include "content/browser/media/media_internals_ui.h"
-#include "content/browser/media/webrtc_internals_ui.h"
 #include "content/browser/service_worker/service_worker_internals_ui.h"
 #include "content/browser/tracing/tracing_ui.h"
 #include "content/public/browser/storage_partition.h"
@@ -16,6 +15,10 @@
 #include "content/public/browser/web_ui.h"
 #include "content/public/common/url_constants.h"
 
+#if defined(ENABLE_WEBRTC)
+#include "content/browser/media/webrtc_internals_ui.h"
+#endif
+
 namespace content {
 
 WebUI::TypeID ContentWebUIControllerFactory::GetWebUIType(
@@ -46,8 +49,6 @@ bool ContentWebUIControllerFactory::UseWebUIBindingsForURL(
 
 WebUIController* ContentWebUIControllerFactory::CreateWebUIControllerForURL(
     WebUI* web_ui, const GURL& url) const {
-  if (url.host() == kChromeUIWebRTCInternalsHost)
-    return new WebRTCInternalsUI(web_ui);
   if (url.host() == kChromeUIGpuHost)
     return new GpuInternalsUI(web_ui);
   if (url.host() == kChromeUIIndexedDBInternalsHost)
@@ -63,6 +64,11 @@ WebUIController* ContentWebUIControllerFactory::CreateWebUIControllerForURL(
     return new TracingUI(web_ui);
 #endif
 
+#if defined(ENABLE_WEBRTC)
+  if (url.host() == kChromeUIWebRTCInternalsHost)
+    return new WebRTCInternalsUI(web_ui);
+#endif
+
   return NULL;
 }