Move base/values.h into the base namespace.

base/value_conversions.h

 // Copyright (c) 2011 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 BASE_VALUE_CONVERSIONS_H_
 #define BASE_VALUE_CONVERSIONS_H_
 #pragma once
 
 // This file contains methods to convert a |FilePath| to a |Value| and back.
 
 #include "base/base_api.h"
 
 class FilePath;
+
+namespace base {
+
 class StringValue;
 class Value;
 
-namespace base {
-
 // The caller takes ownership of the returned value.
 BASE_API StringValue* CreateFilePathValue(const FilePath& in_value);
 BASE_API bool GetValueAsFilePath(const Value& value, FilePath* file_path);
 
 }  // namespace
 
 #endif  // BASE_VALUE_CONVERSIONS_H_