[Media Router] Update Media Router flags post-launch.

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 8a1e6af22fb7333a379fa25e495caf3b3a763e23..68f6f74a8a2f2ea1b405cc90a7916f8e76fcf14e 100644
--- a/chrome/browser/extensions/external_component_loader.cc
+++ b/chrome/browser/extensions/external_component_loader.cc
@@ -15,6 +15,7 @@
 #include "chrome/common/features.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "extensions/common/extension_urls.h"
+#include "extensions/common/feature_switch.h"
 #include "extensions/common/manifest.h"
 
 #if defined(OS_CHROMEOS)
@@ -26,7 +27,7 @@
 #include "chrome/browser/ui/app_list/google_now_extension.h"
 #endif
 
-#if defined(ENABLE_MEDIA_ROUTER) && defined(GOOGLE_CHROME_BUILD)
+#if defined(ENABLE_MEDIA_ROUTER)
 #include "chrome/browser/media/router/media_router_feature.h"
 #endif
 
@@ -54,10 +55,12 @@ void ExternalComponentLoader::StartLoading() {
   }
 #endif
 
-#if defined(ENABLE_MEDIA_ROUTER) && defined(GOOGLE_CHROME_BUILD)
-  if (media_router::MediaRouterEnabled(profile_))
+#if defined(ENABLE_MEDIA_ROUTER)
+  if (media_router::MediaRouterEnabled(profile_) &&
+      FeatureSwitch::load_media_router_component_extension()->IsEnabled()) {
     AddExternalExtension(extension_misc::kMediaRouterStableExtensionId);
-#endif  // defined(ENABLE_MEDIA_ROUTER) && defined(GOOGLE_CHROME_BUILD)
+  }
+#endif  // defined(ENABLE_MEDIA_ROUTER)
 
 #if BUILDFLAG(ENABLE_APP_LIST) && defined(OS_CHROMEOS)
   std::string google_now_extension_id;