Cleanup: Remove unneeded browser_thread.h includes in contents.

content/browser/appcache/chrome_appcache_service.h

 // 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.
 
 #ifndef CONTENT_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_
 #define CONTENT_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "content/common/content_export.h"
-#include "content/public/browser/browser_thread.h"
 #include "webkit/appcache/appcache_policy.h"
 #include "webkit/appcache/appcache_service.h"
 #include "webkit/quota/special_storage_policy.h"
 
 class FilePath;
 
 namespace net {
 class URLRequestContextGetter;
 }
 
@@ skipping 52 matching lines @@
 
 struct ChromeAppCacheServiceDeleter {
   static void Destruct(const ChromeAppCacheService* service) {
     service->DeleteOnCorrectThread();
   }
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_