Create a secondary file thread, FILE_USER_BLOCKING...

content/browser/appcache/chrome_appcache_service_unittest.cc

Index: content/browser/appcache/chrome_appcache_service_unittest.cc
===================================================================
--- content/browser/appcache/chrome_appcache_service_unittest.cc	(revision 113054)
+++ content/browser/appcache/chrome_appcache_service_unittest.cc	(working copy)
@@ -40,8 +40,9 @@
         kProtectedManifestURL(kProtectedManifest),
         kNormalManifestURL(kNormalManifest),
         kSessionOnlyManifestURL(kSessionOnlyManifest),
-        db_thread_(BrowserThread::DB, &message_loop_),
         file_thread_(BrowserThread::FILE, &message_loop_),
+        file_user_blocking_thread_(
+            BrowserThread::FILE_USER_BLOCKING, &message_loop_),
         cache_thread_(BrowserThread::CACHE, &message_loop_),
         io_thread_(BrowserThread::IO, &message_loop_) {
   }
@@ -59,8 +60,8 @@
   const GURL kSessionOnlyManifestURL;
 
  private:
-  BrowserThreadImpl db_thread_;
   BrowserThreadImpl file_thread_;
+  BrowserThreadImpl file_user_blocking_thread_;
   BrowserThreadImpl cache_thread_;
   BrowserThreadImpl io_thread_;
 };