Have content/ create and destroy its own threads.

chrome/browser/browser_about_handler_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 "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
 #include "chrome/browser/browser_about_handler.h"
 #include "chrome/common/about_handler.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/test/test_browser_thread.h"
 #include "googleurl/src/gurl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::BrowserThread;
 
@@ skipping 97 matching lines @@
               chrome_about_handler::WillHandle(url));
     EXPECT_EQ(test_data[i].browser_handled,
               WillHandleBrowserAboutURL(&url, &profile));
     EXPECT_EQ(test_data[i].result_url, url);
   }
 
   // Crash the browser process for chrome://inducebrowsercrashforrealz.
   GURL url(chrome_prefix + chrome::kChromeUIBrowserCrashHost);
   EXPECT_DEATH(WillHandleBrowserAboutURL(&url, NULL), "");
 }