Remove enable_media_router.

chrome/browser/prefs/pref_service_syncable_util.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/prefs/pref_service_syncable_util.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 18 matching lines @@
 }
 
 sync_preferences::PrefServiceSyncable* CreateIncognitoPrefServiceSyncable(
     sync_preferences::PrefServiceSyncable* pref_service,
     PrefStore* incognito_extension_pref_store) {
   // List of keys that cannot be changed in the user prefs file by the incognito
   // profile.  All preferences that store information about the browsing history
   // or behavior of the user should have this property.
   std::vector<const char*> overlay_pref_names;
   overlay_pref_names.push_back(prefs::kBrowserWindowPlacement);
-#if defined(ENABLE_MEDIA_ROUTER)
   overlay_pref_names.push_back(prefs::kMediaRouterTabMirroringSources);
-#endif
   overlay_pref_names.push_back(prefs::kSaveFileDefaultDirectory);
 #if defined(OS_ANDROID)
   overlay_pref_names.push_back(proxy_config::prefs::kProxy);
 #endif
   return pref_service->CreateIncognitoPrefService(
       incognito_extension_pref_store, overlay_pref_names);
 }