GTK: Always relayout the tab strip when the tab strip bounds change.

chrome/browser/ui/gtk/tabs/tab_strip_gtk.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_UI_GTK_TABS_TAB_STRIP_GTK_H_
 #define CHROME_BROWSER_UI_GTK_TABS_TAB_STRIP_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 #include <vector>
@@ skipping 465 matching lines @@
   scoped_ptr<DropInfo> drop_info_;
 
   // The controller for a drag initiated from a Tab. Valid for the lifetime of
   // the drag session.
   scoped_ptr<DraggedTabControllerGtk> drag_controller_;
 
   // A factory that is used to construct a delayed callback to the
   // ResizeLayoutTabsNow method.
   base::WeakPtrFactory<TabStripGtk> weak_factory_;
 
+  // A different factory for calls to Layout().
+  base::WeakPtrFactory<TabStripGtk> layout_factory_;
+
   // True if the tabstrip has already been added as a MessageLoop observer.
   bool added_as_message_loop_observer_;
 
   // Helper for performing tab selection as a result of dragging over a tab.
   HoverTabSelector hover_tab_selector_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(TabStripGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_TABS_TAB_STRIP_GTK_H_