[Offline Pages] Delete associated page along with bookmark.

components/offline_pages/offline_page_bookmark_observer.cc

+// 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.
+
+#include "components/offline_pages/offline_page_bookmark_observer.h"
+
+#include "components/bookmarks/browser/base_bookmark_model_observer.h"
+#include "components/bookmarks/browser/bookmark_node.h"
+#include "components/offline_pages/offline_page_model.h"
+
+namespace offline_pages {
+
+OfflinePageBookmarkObserver::OfflinePageBookmarkObserver(
+    OfflinePageModel* model)
+    : model_(model) {}
+
+void OfflinePageBookmarkObserver::BookmarkModelChanged() {}
+
+void OfflinePageBookmarkObserver::BookmarkNodeRemoved(
+    bookmarks::BookmarkModel* model,
+    const bookmarks::BookmarkNode* parent,
+    int old_index,
+    const bookmarks::BookmarkNode* node,
+    const std::set<GURL>& removed_urls) {
+  model_->ExpireRemovedBookmarkPage(node);
+}
+
+}  // namespace offline_pages