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

chrome/browser/ui/webui/media_router/media_router_test.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/ui/webui/media_router/media_router_test.h"
 
 #include "chrome/test/base/dialog_test_browser_window.h"
 
-MediaRouterTest::MediaRouterTest()
-    : feature_override_(extensions::FeatureSwitch::media_router(), true) {}
+MediaRouterTest::MediaRouterTest() {}
 
-MediaRouterTest::~MediaRouterTest() {
-}
+MediaRouterTest::~MediaRouterTest() {}
 
 BrowserWindow* MediaRouterTest::CreateBrowserWindow() {
   return new DialogTestBrowserWindow;
 }