Thread::Stop() must be called before any subclass's destructor completes.

chrome_frame/urlmon_url_request.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_frame/urlmon_url_request.h"
 
 #include <urlmon.h>
 #include <wininet.h>
 
 #include "base/callback_old.h"
@@ skipping 1395 matching lines @@
     PostMessage(notification_window_, WM_FIRE_PRIVACY_CHANGE_NOTIFICATION, 1,
                 0);
   }
 }
 
 UrlmonUrlRequestManager::ResourceFetcherThread::ResourceFetcherThread(
     const char* name) : base::Thread(name) {
 }
 
 UrlmonUrlRequestManager::ResourceFetcherThread::~ResourceFetcherThread() {
+  Stop();
 }
 
 void UrlmonUrlRequestManager::ResourceFetcherThread::Init() {
   CoInitialize(NULL);
 }
 
 void UrlmonUrlRequestManager::ResourceFetcherThread::CleanUp() {
   CoUninitialize();
 }