[Media Router] Add experiment control logic.

chrome/browser/extensions/external_component_loader.cc

Index: chrome/browser/extensions/external_component_loader.cc
diff --git a/chrome/browser/extensions/external_component_loader.cc b/chrome/browser/extensions/external_component_loader.cc
index 8bace512e06e1e3b2d79163c4868d3d677c276ed..736c491972ec9ffbbc29737064559caa8464c342 100644
--- a/chrome/browser/extensions/external_component_loader.cc
+++ b/chrome/browser/extensions/external_component_loader.cc
@@ -10,7 +10,6 @@
 #include "chrome/browser/search/hotword_service.h"
 #include "chrome/browser/search/hotword_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
-#include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "extensions/common/extension_urls.h"
@@ -25,6 +24,10 @@
 #include "chrome/browser/ui/app_list/google_now_extension.h"
 #endif
 
+#if defined(ENABLE_MEDIA_ROUTER) && defined(GOOGLE_CHROME_BUILD)
+#include "chrome/browser/media/router/media_router_feature.h"
+#endif
+
 namespace extensions {
 
 ExternalComponentLoader::ExternalComponentLoader(Profile* profile)
@@ -50,7 +53,7 @@ void ExternalComponentLoader::StartLoading() {
 #endif
 
 #if defined(ENABLE_MEDIA_ROUTER) && defined(GOOGLE_CHROME_BUILD)
-  if (switches::MediaRouterEnabled())
+  if (media_router::MediaRouterEnabled())
     AddExternalExtension(extension_misc::kMediaRouterStableExtensionId);
 #endif  // defined(ENABLE_MEDIA_ROUTER) && defined(GOOGLE_CHROME_BUILD)