--- a/chrome/browser/profiles/profile_impl.cc	2017-10-11 15:10:23.000000000 -0400
+++ b/chrome/browser/profiles/profile_impl.cc	2017-10-16 17:43:55.102119340 -0400
@@ -388,7 +388,7 @@
   registry->RegisterStringPref(
       prefs::kPrintPreviewDefaultDestinationSelectionRules, std::string());
   registry->RegisterBooleanPref(prefs::kForceEphemeralProfiles, false);
-  registry->RegisterBooleanPref(prefs::kEnableMediaRouter, true);
+  registry->RegisterBooleanPref(prefs::kEnableMediaRouter, false);
 #if !defined(OS_ANDROID)
   registry->RegisterBooleanPref(prefs::kShowCastIconInToolbar, false);
 #endif  // !defined(OS_ANDROID)