Refactor OS X sandbox processing and audit sandbox files

content/renderer/renderer.sb

 ;;
 ;; 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.
 ;;
 
 ; *** The contents of content/common/common.sb are implicitly included here. ***
 
 ; Needed for Fonts.
-(allow file-read* (regex #"^/System/Library/Fonts($|/)"))  ; 10.5.6
-; 10.6 for loading fonts in the renderer.
-; on 10.5 this is needed for the PDF plugin.
+(allow file-read* (regex #"^/System/Library/Fonts($|/)"))
 (allow file-read* (regex #"^/Library/Fonts($|/)"))
-(allow mach-lookup (global-name "com.apple.FontObjectsServer"))  ; 10.5.6
-(allow mach-lookup (global-name "com.apple.FontServer"))  ; 10.6
+(allow mach-lookup (global-name "com.apple.FontObjectsServer"))
+(allow mach-lookup (global-name "com.apple.FontServer"))
 
 (allow file-read*
-  (regex #"^/System/Library/ColorSync($|/)")  ; 10.5.6 - http://crbug.com/46648
+  (regex #"^/System/Library/ColorSync($|/)")  ; http://crbug.com/46648
   (regex #"^/System/Library/Keyboard Layouts($|/)")  ; http://crbug.com/152566
   (literal "/Library/Preferences/.GlobalPreferences.plist") ; http://crbug.com/60917
-  (literal "@USER_HOMEDIR_AS_LITERAL@/Library/Preferences/.GlobalPreferences.plist")
+  (literal (user-homedir-path "/Library/Preferences/.GlobalPreferences.plist"))
 )
 
 ; http://crbug.com/11269
-(allow file-read* (subpath "@USER_HOMEDIR_AS_LITERAL@/Library/Fonts"))  ; 10.6
+(allow file-read* (subpath (user-homedir-path "/Library/Fonts")))
 
 ; http://crbug.com/60917
 (allow file-read-metadata
   (literal "/")
   (literal "/var")
 )
 
 ; http://crbug.com/288697
 (allow file-read*
   (regex #"^/(private/)?etc/localtime$")
   (regex #"^/usr/share/zoneinfo/")
 )
 (allow file-read-metadata
   (regex #"^/(private/)?etc$")
 )