Refactoring: Moving the SafeJsonParser to its own component.

chrome/browser/safe_json_parser.h

-// 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 CHROME_BROWSER_SAFE_JSON_PARSER_H_
-#define CHROME_BROWSER_SAFE_JSON_PARSER_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/callback.h"
-#include "base/memory/scoped_ptr.h"
-#include "content/public/browser/utility_process_host_client.h"
-
-namespace base {
-class ListValue;
-class Value;
-}
-
-namespace IPC {
-class Message;
-}
-
-// SafeJsonParser parses a given JSON safely via a utility process. The object
-// is ref-counted and kept alive after Start() is called until one of the two
-// callbacks is called.
-class SafeJsonParser : public content::UtilityProcessHostClient {
- public:
-  typedef base::Callback<void(scoped_ptr<base::Value>)> SuccessCallback;
-  typedef base::Callback<void(const std::string&)> ErrorCallback;
-
-  SafeJsonParser(const std::string& unsafe_json,
-                 const SuccessCallback& success_callback,
-                 const ErrorCallback& error_callback);
-
-  void Start();
-
- private:
-  ~SafeJsonParser() override;
-
-  void StartWorkOnIOThread();
-
-  void OnJSONParseSucceeded(const base::ListValue& wrapper);
-  void OnJSONParseFailed(const std::string& error_message);
-
-  void ReportResults();
-  void ReportResultOnUIThread();
-
-  // Implementing pieces of the UtilityProcessHostClient interface.
-  bool OnMessageReceived(const IPC::Message& message) override;
-
-  const std::string unsafe_json_;
-  SuccessCallback success_callback_;
-  ErrorCallback error_callback_;
-
-  scoped_ptr<base::Value> parsed_json_;
-  std::string error_;
-
-  DISALLOW_COPY_AND_ASSIGN(SafeJsonParser);
-};
-
-#endif  // CHROME_BROWSER_SAFE_JSON_PARSER_H_