chrome: Cleanup class/struct forward declarations

chrome/browser/browsing_data/cookies_tree_model.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 CHROME_BROWSER_BROWSING_DATA_COOKIES_TREE_MODEL_H_
 #define CHROME_BROWSER_BROWSING_DATA_COOKIES_TREE_MODEL_H_
 
 // TODO(viettrungluu): This header file #includes far too much and has too much
 // inline code (which shouldn't be inline).
 
@@ skipping 15 matching lines @@
 #include "chrome/browser/browsing_data/browsing_data_indexed_db_helper.h"
 #include "chrome/browser/browsing_data/browsing_data_local_storage_helper.h"
 #include "chrome/browser/browsing_data/browsing_data_quota_helper.h"
 #include "chrome/browser/browsing_data/browsing_data_service_worker_helper.h"
 #include "chrome/browser/browsing_data/local_data_container.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "extensions/features/features.h"
 #include "net/ssl/channel_id_store.h"
 #include "ui/base/models/tree_node_model.h"
 
-class BrowsingDataChannelIDHelper;
 class BrowsingDataCookieHelper;
 class CookiesTreeModel;
 class CookieTreeAppCacheNode;
 class CookieTreeAppCachesNode;
 class CookieTreeCacheStorageNode;
 class CookieTreeCacheStoragesNode;
 class CookieTreeChannelIDNode;
 class CookieTreeChannelIDsNode;
 class CookieTreeCookieNode;
 class CookieTreeCookiesNode;
@@ skipping 880 matching lines @@
 
   // Counts how many batches have started already. If this is non-zero and lower
   // than batches_ended_, then this model is still batching updates.
   int batches_started_ = 0;
 
   // Counts how many batches have finished.
   int batches_ended_ = 0;
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_COOKIES_TREE_MODEL_H_