Removes --enable-stacked-tab-strip flag (Stacked Tabs)

chrome/browser/ui/browser_view_prefs.h

 // Copyright (c) 2012 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_UI_BROWSER_VIEW_PREFS_H_
 #define CHROME_BROWSER_UI_BROWSER_VIEW_PREFS_H_
 
 class PrefRegistrySimple;
+class PrefService;
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 namespace chrome {
 
 // Register local state preferences specific to BrowserView.
 void RegisterBrowserViewLocalPrefs(PrefRegistrySimple* registry);
 
 // Register profile-specific preferences specific to BrowserView. These
 // preferences may be synced, depending on the pref's |sync_status| parameter.
 void RegisterBrowserViewProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry);
 
+// Converts deprecated int tabstrip layout type into a boolean value indicating
+// stacked layout preference.
+void MigrateBrowserTabStripPrefs(PrefService* pref);
+
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_BROWSER_VIEW_PREFS_H_