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

components/test_runner/mock_web_speech_recognizer.cc

 // Copyright 2014 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/test_runner/mock_web_speech_recognizer.h"
 
 #include <stddef.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 239 matching lines @@
   }
   task_queue_running_ = false;
 }
 
 void MockWebSpeechRecognizer::StepTask::RunIfValid() {
   if (object_->task_queue_.empty()) {
     object_->task_queue_running_ = false;
     return;
   }
 
-  Task* task = object_->task_queue_.front();
+  MockWebSpeechRecognizer::Task* task = object_->task_queue_.front();
   object_->task_queue_.pop_front();
   task->run();
   delete task;
 
   if (object_->task_queue_.empty()) {
     object_->task_queue_running_ = false;
     return;
   }
 
   object_->delegate_->PostTask(new StepTask(object_));
 }
 
 }  // namespace test_runner