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

apps/prefs.h

Index: apps/prefs.h
diff --git a/apps/prefs.h b/apps/prefs.h
new file mode 100644
index 0000000000000000000000000000000000000000..fcccfec2502b6278fc22ad0516d45149d15e8498
--- /dev/null
+++ b/apps/prefs.h
@@ -0,0 +1,21 @@
+// 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.
+
+#ifndef APPS_PREFS_H_
+#define APPS_PREFS_H_
+
+class PrefRegistrySimple;
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
+namespace apps {
+
+// Register per-profile preferences for the apps system.
+void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
+}  // namespace apps
+
+#endif  // APPS_PREFS_H_