Refactoring recently closed tab filtering

chrome/browser/sessions/session_utils.h

+// Copyright (c) 2011 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_SESSIONS_SESSION_UTILS_H_
+#define CHROME_BROWSER_SESSIONS_SESSION_UTILS_H_
+#pragma once
+
+#include "chrome/browser/sessions/tab_restore_service.h"
+
+class SessionUtils {
+ public:
+  // Fill the passed list from the entries passed as argument filtering out the
+  // ones with the same title and URL as a previous entry. This avoid filling
+  // the list with things that look like duplicates.
+  //
+  // The |filtering_entries| returned are simply references to the one passed in
+  // without copy: There is no transfer of ownership.
+  static void FilteredEntries(const TabRestoreService::Entries& entries,
+                              TabRestoreService::Entries* filtered_entries);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(SessionUtils);
+};
+
+#endif  // CHROME_BROWSER_SESSIONS_SESSION_UTILS_H_