Remove use of deprecated MessageLoop methods in components.

components/safe_json/testing_json_parser.cc

 // Copyright 2015 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 "components/safe_json/testing_json_parser.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/json/json_reader.h"
 #include "base/location.h"
-#include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 
 namespace safe_json {
 
 namespace {
 
 SafeJsonParser* CreateTestingJsonParser(
     const std::string& unsafe_json,
     const SafeJsonParser::SuccessCallback& success_callback,
     const SafeJsonParser::ErrorCallback& error_callback) {
@@ skipping 20 matching lines @@
 TestingJsonParser::~TestingJsonParser() {}
 
 void TestingJsonParser::Start() {
   int error_code;
   std::string error;
   std::unique_ptr<base::Value> value = base::JSONReader::ReadAndReturnError(
       unsafe_json_, base::JSON_PARSE_RFC, &error_code, &error);
 
   // Run the callback asynchronously. Post the delete task first, so that the
   // completion callbacks may quit the run loop without leaking |this|.
-  base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
-  base::MessageLoop::current()->PostTask(
+  base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, value ? base::Bind(success_callback_, base::Passed(&value))
                        : base::Bind(error_callback_, error));
 }
 
 }  // namespace