Replace ancient crufty AppCacheThread with much improved MessageLoopProxy usage.

webkit/appcache/appcache_service.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 "webkit/appcache/appcache_service.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
 #include "net/base/io_buffer.h"
@@ skipping 416 matching lines @@
   STLDeleteElements(&pending_helpers_);
   if (quota_client_)
     quota_client_->NotifyAppCacheDestroyed();
 
   // Destroy storage_ first; ~AppCacheStorageImpl accesses other data members
   // (special_storage_policy_).
   storage_.reset();
 }
 
 void AppCacheService::Initialize(const FilePath& cache_directory,
+                                 base::MessageLoopProxy* db_thread,
                                  base::MessageLoopProxy* cache_thread) {
   DCHECK(!storage_.get());
   AppCacheStorageImpl* storage = new AppCacheStorageImpl(this);
-  storage->Initialize(cache_directory, cache_thread);
+  storage->Initialize(cache_directory, db_thread, cache_thread);
   storage_.reset(storage);
 }
 
 void AppCacheService::CanHandleMainResourceOffline(
     const GURL& url,
     const GURL& first_party,
     net::CompletionCallback* callback) {
   CanHandleOfflineHelper* helper =
       new CanHandleOfflineHelper(this, url, first_party, callback);
   helper->Start();
@@ skipping 37 matching lines @@
   backends_.insert(
       BackendMap::value_type(backend_impl->process_id(), backend_impl));
 }
 
 void AppCacheService::UnregisterBackend(
     AppCacheBackendImpl* backend_impl) {
   backends_.erase(backend_impl->process_id());
 }
 
 }  // namespace appcache