Tests: Simplify SequencedWorkerPoolOwner, call Shutdown on destructor.

components/component_updater/component_updater_service_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 <limits>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 155 matching lines @@
       pool->GetSequencedTaskRunner(pool->GetSequenceToken()),
       message_loop_.task_runner());
 
   update_client_ = new MockUpdateClient();
   EXPECT_CALL(update_client(), AddObserver(_)).Times(1);
   component_updater_.reset(new CrxUpdateService(config_, update_client_));
 }
 
 ComponentUpdaterTest::~ComponentUpdaterTest() {
   EXPECT_CALL(update_client(), RemoveObserver(_)).Times(1);
-  worker_pool_->pool()->Shutdown();
   component_updater_.reset();
 }
 
 void ComponentUpdaterTest::SetUp() {
 }
 
 void ComponentUpdaterTest::TearDown() {
 }
 
 void ComponentUpdaterTest::RunThreads() {
@@ skipping 161 matching lines @@
 
   EXPECT_TRUE(component_updater().RegisterComponent(crx_component));
   component_updater().MaybeThrottle(
       "jebgalgnebhfojomionfpkfelancnnkf",
       base::Bind(&ComponentUpdaterTest::ReadyCallback));
 
   RunThreads();
 }
 
 }  // namespace component_updater