Remove obsolete code that handles menu key release for chromeos

ui/views/focus/focus_manager.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 UI_VIEWS_FOCUS_FOCUS_MANAGER_H_
 #define UI_VIEWS_FOCUS_FOCUS_MANAGER_H_
 
 #include <list>
 #include <map>
 
@@ skipping 282 matching lines @@
   // The storage id used in the ViewStorage to store/restore the view that last
   // had focus.
   int stored_focused_view_storage_id_;
 
   // The reason why the focus most recently changed.
   FocusChangeReason focus_change_reason_;
 
   // The list of registered FocusChange listeners.
   ObserverList<FocusChangeListener, true> focus_change_listeners_;
 
-#if defined(USE_X11)
-  // Indicates if we should handle the upcoming Alt key release event.
-  bool should_handle_menu_key_release_;
-#endif
-
   // See description above getter.
   bool is_changing_focus_;
 
   DISALLOW_COPY_AND_ASSIGN(FocusManager);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_FOCUS_FOCUS_MANAGER_H_