[Media Router] Add experiment control logic.

chrome/browser/ui/toolbar/wrench_menu_model.cc

Index: chrome/browser/ui/toolbar/wrench_menu_model.cc
diff --git a/chrome/browser/ui/toolbar/wrench_menu_model.cc b/chrome/browser/ui/toolbar/wrench_menu_model.cc
index 81eed59c4f6ed576949b1e5c56e7de6d7fe15c3c..1bd6b5ea46e71b6fb6b16a7baffbdec1821d3455 100644
--- a/chrome/browser/ui/toolbar/wrench_menu_model.cc
+++ b/chrome/browser/ui/toolbar/wrench_menu_model.cc
@@ -81,6 +81,10 @@
 #include "ash/shell.h"
 #endif
 
+#if defined(ENABLE_MEDIA_ROUTER)
+#include "chrome/browser/media/router/media_router_feature.h"
+#endif
+
 using base::UserMetricsAction;
 using content::WebContents;
 
@@ -889,8 +893,11 @@ void WrenchMenuModel::Build() {
 
   CreateZoomMenu();
   AddItemWithStringId(IDC_PRINT, IDS_PRINT);
-  if (switches::MediaRouterEnabled() && !browser()->profile()->IsOffTheRecord())
+#if defined(ENABLE_MEDIA_ROUTER)
+  if (media_router::MediaRouterEnabled() &&
+      !browser()->profile()->IsOffTheRecord())

[msw, 2015/10/23 20:18:43]

nit: add curly braces

[imcheng, 2015/10/23 21:39:26]

Done.

     AddItemWithStringId(IDC_ROUTE_MEDIA, IDS_MEDIA_ROUTER_MENU_ITEM_TITLE);
+#endif
   AddItemWithStringId(IDC_FIND, IDS_FIND);
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableDomDistiller))