Move enable extensions define to a build flag.

chrome/browser/media/router/media_router_feature.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/media/router/media_router_feature.h"
 
 #include "build/build_config.h"
 #include "content/public/browser/browser_context.h"
+#include "extensions/features/features.h"
 
 #if defined(ENABLE_MEDIA_ROUTER)
-#if defined(OS_ANDROID) || defined(ENABLE_EXTENSIONS)
+#if defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/common/pref_names.h"
 #include "components/prefs/pref_service.h"
 #include "components/user_prefs/user_prefs.h"
-#endif  // defined(OS_ANDROID) || defined(ENABLE_EXTENSIONS)
+#endif  // defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 #endif  // defined(ENABLE_MEDIA_ROUTER)
 
 namespace media_router {
 
 #if defined(ENABLE_MEDIA_ROUTER)
-#if defined(OS_ANDROID) || defined(ENABLE_EXTENSIONS)
+#if defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 namespace {
 const PrefService::Preference* GetMediaRouterPref(
     content::BrowserContext* context) {
   return user_prefs::UserPrefs::Get(context)
       ->FindPreference(prefs::kEnableMediaRouter);
 }
 }  // namespace
-#endif  // defined(OS_ANDROID) || defined(ENABLE_EXTENSIONS)
+#endif  // defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 #endif  // defined(ENABLE_MEDIA_ROUTER)
 
 bool MediaRouterEnabled(content::BrowserContext* context) {
 #if defined(ENABLE_MEDIA_ROUTER)
-#if defined(OS_ANDROID) || defined(ENABLE_EXTENSIONS)
+#if defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
   const PrefService::Preference* pref = GetMediaRouterPref(context);
   // Only use the pref value if it set from a mandatory policy.
   if (pref->IsManaged() && !pref->IsDefaultValue()) {
     bool allowed = false;
     CHECK(pref->GetValue()->GetAsBoolean(&allowed));
     return allowed;
   }
   return true;
-#else  // !(defined(OS_ANDROID) || defined(ENABLE_EXTENSIONS))
+#else  // !(defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS))
   return false;
-#endif  // defined(OS_ANDROID) || defined(ENABLE_EXTENSIONS)
+#endif  // defined(OS_ANDROID) || BUILDFLAG(ENABLE_EXTENSIONS)
 #else   // !defined(ENABLE_MEDIA_ROUTER)
   return false;
 #endif  // defined(ENABLE_MEDIA_ROUTER)
 }
 
 }  // namespace media_router