Have content/ create and destroy its own threads.

chrome/browser/component_updater/component_installers_unittest.cc

 // Copyright (c) 2011 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 "chrome/browser/component_updater/flash_component_installer.h"
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/json/json_value_serializer.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/version.h"
 #include "build/build_config.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/test/test_browser_thread.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::BrowserThread;
 
@@ skipping 40 matching lines @@
   // This just tests the API (i.e., Pepper interfaces).
   EXPECT_TRUE(VetoPepperFlashIntefaces(
       static_cast<base::DictionaryValue*>(root.get())));
 
   // This checks that the whole manifest is compatible.
   Version version;
   EXPECT_TRUE(CheckPepperFlashManifest(
       static_cast<base::DictionaryValue*>(root.get()), &version));
   EXPECT_TRUE(version.IsValid());
 }