Trim ICU data to reduce the download size/memory usage

icu52/README.chromium

 Name: icu
 URL: http://site.icu-project.org/
 Version: 52.1
 License: MIT
 Security Critical: yes
 
 Description:
 This directory contains the source code of ICU 52.1 for C/C++
 
 1. It was obtained with the following:
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     b. ISO-2022-JP-[1-4] is dropped.
     c. SCSU, BOCU, ISCII, UTF-7 conversion is diabled leading to 
        the 47kB reduction in the code size.
 
 5. Locale changes
   - patches/locale1.patch :
       a. Exemplar character set changes for zh*, ja + 9 Indian locales
       b. Minor fixes for Korean, a few Indic (AmPmMarkers) and 
       others (datetime format)
 
-  - patches/locale2.patch :
-      The minimum locale data Chrome needs for 47 languages Chrome is
-      not localized to. Each locale data file has ExemplarCharacters,
-      LocaleScript, layout, and the name of the language for a locale
-      in its native language.
-
   - Locale build configuration files: To include the full locale data
     for Chrome's UI languages and the minimum locale data for other locales,
     add reslocal.mk or {trns,sprep,rbnf,coll}local.mk files to
     source/data/{coll,curr,lang.locale,curr,region,translit,zone,rbnf,sprep}.
 
-  - In source/data/region, run the following command to get rid of numeric region
-    display names we don't use (everything other than 419).
-     $ sed -i  '/[0-35-9][0-9][0-9]{/ d' *.txt
+  - Run scripts/trimdata.sh
+      a. Trim the locale data for Chrome's UI langauges :
+         locales, lang, region, currency
+      b. Trim the locale data for non-UI languages to the bare minimum :
+        ExemplarCharacters, LocaleScript, layout, and the name of the
+        language for a locale in its native language.
 
   - android/patch_locale.sh (to be run for Android build only):
       Makes changes to source/data/{curr,region,lang} to exclude these data
       except the language and script names of zh_Hans and zh_Hant.
  
   - Add tg.txt to source/data/locale source/data/lang to add the minimal locale
     data necessary for the spellchecker. In both directories, add tg.txt to
     reslocal.mk
 
 6. Removal of unihan collation tables from data/coll/{zh,ja,ko}.txt
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     - android/icudt52l_dat.S : Built on Linux with all the patches above and
       android/brkitr.patch applied and android/patch_locale.sh executed, and
       checked in.
     - android/icudtl.dat : Generated as icudt52l.dat in
       {BUILD_DIR_ROOT}/data/out/tmp along with icudt52l_dat.S and
       copied to the above location with '52' dropped in its name.
 
 
 11. Change export of U_ICUDATA_ENTRY_POINT from U_IMPORT to U_EXPORT.
     - patches/declspec.patch