Tests: Simplify SequencedWorkerPoolOwner, call Shutdown on destructor.

base/threading/sequenced_task_runner_handle_unittest.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 "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 43 matching lines @@
 TEST_F(SequencedTaskRunnerHandleTest, FromSequencedWorkerPool) {
   // Wrap the SequencedWorkerPool to avoid leaks due to its asynchronous
   // destruction.
   SequencedWorkerPoolOwner owner(3, "Test");
   WaitableEvent event(false, false);
   owner.pool()->PostSequencedWorkerTask(
       owner.pool()->GetSequenceToken(), FROM_HERE,
       base::Bind(&SequencedTaskRunnerHandleTest::GetTaskRunner,
                  base::Bind(&WaitableEvent::Signal, base::Unretained(&event))));
   event.Wait();
-  owner.pool()->Shutdown();
 }
 
 class ThreadRunner : public DelegateSimpleThread::Delegate {
  public:
   void Run() override {
     ASSERT_FALSE(SequencedTaskRunnerHandle::IsSet());
   }
 
  private:
   Closure callback_;
 };
 
 TEST_F(SequencedTaskRunnerHandleTest, FromSimpleThread) {
   ThreadRunner thread_runner;
   DelegateSimpleThread thread(&thread_runner, "Background thread");
   thread.Start();
   thread.Join();
 }
 
 }  // namespace
 }  // namespace base