Make test_runner::WebTask an internal detail of components/test_runner.

components/test_runner/web_task.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 COMPONENTS_TEST_RUNNER_WEB_TASK_H_
 #define COMPONENTS_TEST_RUNNER_WEB_TASK_H_
 
 #include <vector>
 
 #include "base/macros.h"
+#include "third_party/WebKit/public/platform/WebTaskRunner.h"
 
 namespace test_runner {
 
 class WebTaskList;
 
 // WebTask represents a task which can run by WebTestDelegate::postTask() or
 // WebTestDelegate::postDelayedTask().
-class WebTask {
+class WebTask : public blink::WebTaskRunner::Task {
  public:
   explicit WebTask(WebTaskList*);
-  virtual ~WebTask();
+  ~WebTask() override;
 
   // The main code of this task.
   // An implementation of run() should return immediately if cancel() was
   // called.
-  virtual void run() = 0;
+  void run() override = 0;
   virtual void cancel() = 0;
 
  protected:
   WebTaskList* task_list_;
 };
 
 class WebTaskList {
  public:
   WebTaskList();
   ~WebTaskList();
@@ skipping 31 matching lines @@
 
   virtual void RunIfValid() = 0;
 
  protected:
   T* object_;
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_WEB_TASK_H_