Update WebTask in chromium c++ style

content/shell/renderer/test_runner/web_task.cc

+// 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.
+
+#include "content/shell/renderer/test_runner/web_task.h"
+
+#include <algorithm>
+
+#include "third_party/WebKit/public/web/WebKit.h"
+
+namespace content {
+
+WebTask::WebTask(WebTaskList* list) : task_list_(list) {
+  task_list_->RegisterTask(this);
+}
+
+WebTask::~WebTask() {
+  if (task_list_)
+    task_list_->UnregisterTask(this);
+}
+
+WebTaskList::WebTaskList() {
+}
+
+WebTaskList::~WebTaskList() {
+  RevokeAll();
+}
+
+void WebTaskList::RegisterTask(WebTask* task) {
+  tasks_.push_back(task);
+}
+
+void WebTaskList::UnregisterTask(WebTask* task) {
+  std::vector<WebTask*>::iterator iter =
+      std::find(tasks_.begin(), tasks_.end(), task);
+  if (iter != tasks_.end())
+    tasks_.erase(iter);
+}
+
+void WebTaskList::RevokeAll() {
+  while (!tasks_.empty())
+    tasks_[0]->cancel();
+}
+
+}  // namespace content