Revert of Merge apps/pref* to extensions/browser/pref*

apps/prefs.cc

+// Copyright 2013 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 "apps/prefs.h"
+
+#include "apps/pref_names.h"
+#include "base/prefs/pref_registry_simple.h"
+#include "components/pref_registry/pref_registry_syncable.h"
+
+namespace apps {
+
+void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
+#if !defined(OS_MACOSX)
+  registry->RegisterBooleanPref(
+      prefs::kAppFullscreenAllowed, true,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+#endif
+}
+
+}  // namespace apps