Replace ancient crufty AppCacheThread with much improved MessageLoopProxy usage.

webkit/appcache/appcache_thread.cc

Index: webkit/appcache/appcache_thread.cc
===================================================================
--- webkit/appcache/appcache_thread.cc	(revision 100467)
+++ webkit/appcache/appcache_thread.cc	(working copy)
@@ -1,13 +0,0 @@
-// Copyright (c) 2009 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 "webkit/appcache/appcache_thread.h"
-
-namespace appcache {
-
-// static
-int AppCacheThread::db_;
-int AppCacheThread::io_;
-
-}  // namespace appcache