Correct ENABLE_MEDIA_ROUTER defines to fix compilation without it.

chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc

Index: chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc
diff --git a/chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc b/chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc
index c96b7653f08003673fc5a42a0a7f8e43568ccc16..e9c1f0dfaf63d3de754b247a120a4a5d40e2f0e4 100644
--- a/chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc
+++ b/chrome/browser/ui/toolbar/component_toolbar_actions_factory.cc
@@ -43,8 +43,10 @@ ComponentToolbarActionsFactory::GetComponentToolbarActions() {
   // (since each will have an action in the toolbar or overflow menu), this
   // should be okay. If this changes, we should rethink this design to have,
   // e.g., RegisterChromeAction().
+#if defined(ENABLE_MEDIA_ROUTER)
   if (media_router_ui_enabled_)
     component_actions.push_back(new MediaRouterAction());
+#endif  // defined(ENABLE_MEDIA_ROUTER)
 
   return component_actions.Pass();
 }