[Offline Pages] Delete associated page along with bookmark.

components/bookmarks/browser/offline_page_bookmark_observer.h

+// Copyright 2016 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 COMPONENTS_BOOKMARKS_BROWSER_OFFLINE_PAGE_BOOKMARK_OBSERVER_H_
+#define COMPONENTS_BOOKMARKS_BROWSER_OFFLINE_PAGE_BOOKMARK_OBSERVER_H_
+
+#include "components/bookmarks/browser/base_bookmark_model_observer.h"
+
+namespace bookmarks {
+
+class OfflinePageBookmarkObserver : public BaseBookmarkModelObserver {
+ public:
+  // Implement BaseBookmarkModelObserver
+  void BookmarkModelChanged() override {}
+  void BookmarkNodeRemoved(BookmarkModel* model,
+                           const BookmarkNode* parent,
+                           int old_index,
+                           const BookmarkNode* node,
+                           const std::set<GURL>& removed_urls) override {}
+};
+
+}  // namespace bookmarks
+
+#endif  // COMPONENTS_BOOKMARKS_BROWSER_OFFLINE_PAGE_BOOKMARK_OBSERVER_H_