Move prefs-related files under chrome/browser/ into a prefs/ subdir.

chrome/browser/prefs/dummy_pref_store.cc

 // Copyright (c) 2010 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/dummy_pref_store.h"
+#include "chrome/browser/prefs/dummy_pref_store.h"
 
 #include "base/values.h"
 
 DummyPrefStore::DummyPrefStore()
     : prefs_(new DictionaryValue()),
       read_only_(true),
       prefs_written_(false) { }
 
 PrefStore::PrefReadError DummyPrefStore::ReadPrefs() {
   prefs_.reset(new DictionaryValue());
   return PrefStore::PREF_READ_ERROR_NONE;
 }
 
 bool DummyPrefStore::WritePrefs() {
   prefs_written_ = true;
   return prefs_written_;
 }