[Offline Pages] Delete associated page along with bookmark.

components/offline_pages/offline_page_bookmark_observer.h

Index: components/offline_pages/offline_page_bookmark_observer.h
diff --git a/components/offline_pages/offline_page_bookmark_observer.h b/components/offline_pages/offline_page_bookmark_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..342671c5bbb044cb19da350e081d25ee2d760eb6
--- /dev/null
+++ b/components/offline_pages/offline_page_bookmark_observer.h
@@ -0,0 +1,38 @@
+// 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_OFFLINE_PAGES_OFFLINE_PAGE_BOOKMARK_OBSERVER_H_
+#define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_BOOKMARK_OBSERVER_H_
+
+#include "components/bookmarks/browser/base_bookmark_model_observer.h"
+
+namespace bookmarks {
+class BookmarkModel;
+class BookmarkNode;
+}  // namespace bookmarks
+
+namespace offline_pages {
+
+class OfflinePageModel;
+
+class OfflinePageBookmarkObserver
+    : public bookmarks::BaseBookmarkModelObserver {
+ public:
+  OfflinePageBookmarkObserver(OfflinePageModel* model);
+
+  void BookmarkModelChanged() override;
+
+  void BookmarkNodeRemoved(bookmarks::BookmarkModel* model,
+                           const bookmarks::BookmarkNode* parent,
+                           int old_index,
+                           const bookmarks::BookmarkNode* node,
+                           const std::set<GURL>& removed_urls) override;
+
+ private:
+  OfflinePageModel* model_;
+};
+
+}  // namespace offline_pages
+
+#endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_BOOKMARK_OBSERVER_H_