base: Remove unnecessary using declarations from values.h

content/common/json_value_serializer.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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 CONTENT_COMMON_JSON_VALUE_SERIALIZER_H_
 #define CONTENT_COMMON_JSON_VALUE_SERIALIZER_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/values.h"
 
-class JSONStringValueSerializer : public ValueSerializer {
+class JSONStringValueSerializer : public base::ValueSerializer {
  public:
   // json_string is the string that will be source of the deserialization
   // or the destination of the serialization.  The caller of the constructor
   // retains ownership of the string.
   explicit JSONStringValueSerializer(std::string* json_string)
       : json_string_(json_string),
         initialized_with_const_string_(false),
         pretty_print_(false),
         allow_trailing_comma_(false) {
   }
@@ skipping 33 matching lines @@
  private:
   std::string* json_string_;
   bool initialized_with_const_string_;
   bool pretty_print_;  // If true, serialization will span multiple lines.
   // If true, deserialization will allow trailing commas.
   bool allow_trailing_comma_;
 
   DISALLOW_COPY_AND_ASSIGN(JSONStringValueSerializer);
 };
 
-class JSONFileValueSerializer : public ValueSerializer {
+class JSONFileValueSerializer : public base::ValueSerializer {
  public:
   // json_file_patch is the path of a file that will be source of the
   // deserialization or the destination of the serialization.
   // When deserializing, the file should exist, but when serializing, the
   // serializer will attempt to create the file at the specified location.
   explicit JSONFileValueSerializer(const FilePath& json_file_path)
     : json_file_path_(json_file_path) {}
 
   virtual ~JSONFileValueSerializer() {}
 
@@ skipping 39 matching lines @@
   FilePath json_file_path_;
 
   // A wrapper for file_util::ReadFileToString which returns a non-zero
   // JsonFileError if there were file errors.
   int ReadFileToString(std::string* json_string);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSONFileValueSerializer);
 };
 
 #endif  // CONTENT_COMMON_JSON_VALUE_SERIALIZER_H_