Attemp 2 at:

chrome/browser/cocoa/browser_window_cocoa.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_COCOA_BROWSER_WINDOW_COCOA_H_
 #define CHROME_BROWSER_COCOA_BROWSER_WINDOW_COCOA_H_
 
 #include "base/task.h"
 #include "chrome/browser/browser_window.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
@@ skipping 87 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);
 
   // Adds the given FindBar cocoa controller to this browser window.
   void AddFindBar(FindBarCocoaController* find_bar_cocoa_controller);
 
   // Returns the cocoa-world BrowserWindowController
   BrowserWindowController* cocoa_controller() { return controller_; }
 
  protected:
   virtual void DestroyBrowser();
 
  private:
   int GetCommandId(const NativeWebKeyboardEvent& event);
   bool HandleKeyboardEventInternal(NSEvent* event);
   NSWindow* window() const;  // Accessor for the (current) |NSWindow|.
 
   NotificationRegistrar registrar_;
   Browser* browser_;  // weak, owned by controller
   BrowserWindowController* controller_;  // weak, owns us
   ScopedRunnableMethodFactory<Browser> confirm_close_factory_;
 };
 
 #endif  // CHROME_BROWSER_COCOA_BROWSER_WINDOW_COCOA_H_