Replace ancient crufty AppCacheThread with much improved MessageLoopProxy usage.

webkit/appcache/appcache_thread.h

-// 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.
-
-#ifndef WEBKIT_APPCACHE_APPCACHE_THREAD_H_
-#define WEBKIT_APPCACHE_APPCACHE_THREAD_H_
-
-#include "base/task.h"
-
-namespace tracked_objects {
-class Location;
-}
-
-namespace appcache {
-
-// The appcache system uses two threads, an IO thread and a DB thread.
-// It does not create these threads, the embedder is responsible for
-// providing them to the appcache library by providing a concrete
-// implementation of the PostTask and CurrentlyOn methods declared here,
-// and by calling the Init method prior to using the appcache library.
-class AppCacheThread {
- public:
-  static void Init(int db, int io) {
-    db_ = db;
-    io_ = io;
-  }
-  static int db() { return db_; }
-  static int io() { return io_; }
-
-  static bool PostTask(int id,
-                       const tracked_objects::Location& from_here,
-                       Task* task);
-  static bool CurrentlyOn(int id);
-
-  template <class T>
-  static bool DeleteSoon(int id,
-                         const tracked_objects::Location& from_here,
-                         T* object) {
-    return PostTask(id, from_here, new DeleteTask<T>(object));
-  }
-
- private:
-  AppCacheThread();
-  ~AppCacheThread();
-
-  static int db_;
-  static int io_;
-};
-
-}  // namespace appcache
-
-#endif  // WEBKIT_APPCACHE_APPCACHE_THREAD_H_