Widen sandbox rules to allow access to downloaded Sierra fonts

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($|/)"))
 (allow file-read* (regex #"^/Library/Fonts($|/)"))
 (allow mach-lookup (global-name "com.apple.FontObjectsServer"))
 (allow mach-lookup (global-name "com.apple.FontServer"))
 (allow mach-lookup (global-name "com.apple.fonts"))
+(allow file-read* (extension "com.apple.app-sandbox.read")) ; https://crbug.com/662686
 
 ; Allow read-only connection to launchservicesd. https://crbug.com/533537
 (allow mach-lookup (global-name "com.apple.lsd.mapdb"))
 
 (allow file-read*
   (regex #"^/System/Library/ColorSync($|/)")  ; https://crbug.com/46648
   (regex #"^/System/Library/Keyboard Layouts($|/)")  ; https://crbug.com/152566
   (literal "/Library/Preferences/.GlobalPreferences.plist") ; https://crbug.com/60917
   (literal (user-homedir-path "/Library/Preferences/.GlobalPreferences.plist")))
 
 ; https://crbug.com/11269
 (allow file-read* (subpath (user-homedir-path "/Library/Fonts")))
 
 ; https://crbug.com/60917
 (allow file-read-metadata
   (literal "/")
   (literal "/var"))
 
 ; https://crbug.com/288697
 (allow file-read*
   (regex #"^/(private/)?etc/localtime$")
   (regex #"^/usr/share/zoneinfo/"))
 
 (allow file-read-metadata (regex #"^/(private/)?etc$"))
 
 ; https://crbug.com/605840
 ; file-read-metadata /System/Library/LinguisticData/en/US/hyphenation.dat
 ; for CFStringIsHyphenationAvailableForLocale and CFStringGetHyphenationLocationBeforeIndex
 (allow file-read* (subpath "/System/Library/LinguisticData"))