Tests: Simplify SequencedWorkerPoolOwner, call Shutdown on destructor.

net/extras/sqlite/sqlite_persistent_cookie_store_perftest.cc

 // Copyright (c) 2012 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 "net/extras/sqlite/sqlite_persistent_cookie_store.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 81 matching lines @@
     // ~SequencedWorkerPoolOwner blocks on pool shutdown.
     pool_owner_.reset(new base::SequencedWorkerPoolOwner(1, "pool"));
 
     store_ = new SQLitePersistentCookieStore(
         temp_dir_.path().Append(cookie_filename), client_task_runner(),
         background_task_runner(), false, NULL);
   }
 
   void TearDown() override {
     store_ = NULL;
-    pool_owner_->pool()->Shutdown();
   }
 
  protected:
   base::MessageLoop main_loop_;
   scoped_ptr<base::SequencedWorkerPoolOwner> pool_owner_;
   base::WaitableEvent loaded_event_;
   base::WaitableEvent key_loaded_event_;
   std::vector<CanonicalCookie*> cookies_;
   base::ScopedTempDir temp_dir_;
   scoped_refptr<SQLitePersistentCookieStore> store_;
@@ skipping 19 matching lines @@
 // Test the performance of load
 TEST_F(SQLitePersistentCookieStorePerfTest, TestLoadPerformance) {
   base::PerfTimeLogger timer("Load all cookies");
   Load();
   timer.Done();
 
   ASSERT_EQ(15000U, cookies_.size());
 }
 
 }  // namespace net