bookmarks: Get rid of the dependency on history_notifications.h

chrome/browser/history/history_details.h

+// Copyright 2013 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_HISTORY_HISTORY_DETAILS_H_
+#define CHROME_BROWSER_HISTORY_HISTORY_DETAILS_H_
+
+namespace history {
+
+// Base class for history notifications. This needs only a virtual destructor
+// so that the history service's broadcaster can delete it when the request
+// is complete.
+struct HistoryDetails {
+ public:
+  virtual ~HistoryDetails() {}
+};
+
+}  // namespace history
+
+#endif  // CHROME_BROWSER_HISTORY_HISTORY_DETAILS_H_