icu local change part1

icu52/source/data/sprep/spreplocal.mk

 # *   Copyright (C) 2011, International Business Machines
 # *   Corporation and others.  All Rights Reserved.
 # A list of txt's to build
 #
 #  * To add an additional locale to the list: 
 #    _____________________________________________________
 #    |  SPREP_SOURCE_LOCAL =   myStringPrep.txt ...
 #
 #  * To REPLACE the default list and only build a subset of files:
 #    _____________________________________________________
 #    |  SPREP_SOURCE = rfc4518.txt
 #
-# Chromium: Drop all other stringprep files other than RFC 3491 for IDNA 2003. ICU 4.6
-# supports UTS 46 (IDNA2003, transition, and IDNA 2008).
-# If we ever need to support other stringprep (e.g. LDAP, XMPP, SASL), we have to add back
-# the corresponding prep files.
+# Chromium: Drop all the stringprep files including RFC 3491 for IDNA 2003.
+# ICU supports UTS 46 (IDNA2003, transition, and IDNA 2008), but Chromium
+# does not use IDNA 2003 any more and uses transitional/IDNA 2008 for which
+# a separate resource (uts46.nrm) is used. Therefore, we can drop rfc3491 as
+# well.
+# If we ever need to support other stringprep (e.g. LDAP, XMPP, SASL),
+# we have to add back the corresponding prep files.
 # rfc3491 : stringprep profile for IDN 2003
 # rfc3530 : NFS
 # rfc3722 : String Profile for Internet Small Computer 
 #           Systems Interface (iSCSI) Names
 # rfc3920 : XMPP (Extensible Messaging and Presence Protocol)
 # rfc4011 : Policy Based Management Information Base, SNMP
 # rfc4013 : SASLprep: Stringprep Profile for User Names and Passwords
 # rfc4505 :  Anonymous Simple Authentication and Security Layer (SASL) Mechanism
 # rfc4518 : LDAP  Internationalized String Preparation
 #
-SPREP_SOURCE = rfc3491.txt
+SPREP_SOURCE =