Do not ignore F3-F7 and F9 key presses on an Apple keyboard.

ui/base/keycodes/keyboard_codes_posix.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.
 
 /*
  * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com. All rights reserved.
  * Copyright (C) 2008, 2009 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 189 matching lines @@
   VKEY_CRSEL = 0xF7,
   VKEY_EXSEL = 0xF8,
   VKEY_EREOF = 0xF9,
   VKEY_PLAY = 0xFA,
   VKEY_ZOOM = 0xFB,
   VKEY_NONAME = 0xFC,
   VKEY_PA1 = 0xFD,
   VKEY_OEM_CLEAR = 0xFE,
   VKEY_UNKNOWN = 0,
 
-  // POSIX specific VKEYs. Note that as of Windows SDK 7.1, 0xD8-DA are
+  // POSIX specific VKEYs. Note that as of Windows SDK 7.1, 0xD8-DA and 0xE8 are
   // unassigned.
   VKEY_BRIGHTNESS_DOWN = 0xD8,
-  VKEY_BRIGHTNESS_UP = 0xD9
+  VKEY_BRIGHTNESS_UP = 0xD9,
+  VKEY_KBD_BRIGHTNESS_DOWN = 0xDA,
+  VKEY_KBD_BRIGHTNESS_UP = 0xE8
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_KEYCODES_KEYBOARD_CODES_POSIX_H_