Attemp 2 at:

chrome/browser/gtk/browser_window_gtk.h

 // Copyright (c) 2010 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_GTK_BROWSER_WINDOW_GTK_H_
 #define CHROME_BROWSER_GTK_BROWSER_WINDOW_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <map>
@@ skipping 105 matching lines @@
                             bool show_history);
   virtual void ShowAppMenu();
   virtual bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                                       bool* is_keyboard_shortcut);
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
   virtual void ShowCreateShortcutsDialog(TabContents* tab_contents);
   virtual void Cut();
   virtual void Copy();
   virtual void Paste();
   virtual void ToggleTabStripMode() {}
-  virtual void SetToolbarCollapsedMode(bool val) {}
 
   // Overridden from NotificationObserver:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   // Overridden from TabStripModelObserver:
   virtual void TabDetachedAt(TabContents* contents, int index);
   virtual void TabSelectedAt(TabContents* old_contents,
                              TabContents* new_contents,
@@ skipping 293 matching lines @@
 
   // The accelerator group used to handle accelerators, owned by this object.
   GtkAccelGroup* accel_group_;
 
   scoped_ptr<FullscreenExitBubbleGtk> fullscreen_exit_bubble_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserWindowGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_BROWSER_WINDOW_GTK_H_