1. Add {coll,curr,lang,locales,rbnf,region,sprep,translit,unit,zone}/*local.mk
to exclude locale data for languages/locales that Chromium does not need.

2. Run scripts/trim_data.sh to cut down the data size further by excluding
unused entries in each locale files.
   - Keep the display names for languages/scripts/locales in Chrome's
     Accept-Language list and remove the display names outside the set.
   - Minimize the locale data in data/{locales,lang} for non-UI languages
     in the A-L list. For them,
     we just need the "native" display name and exemplar character set.
   - Exclude historic, obscure and otherwise unnecessary currency display
     names.
   - Drop unnecessary Chinese collation rules; Big5/GB2312/UniHan.
   - Keep only the minimal unit data for duration and compound units.

3. Add css3transform.txt to data/translit for Greek upper/lowercasing support.

4. Add the minimal locale data for ckb and ku.

5. The tz db was updated previously to 2014j (the latest) so that no change
   is made except for README.chromium update.

6. Add the minimal locale data for ckb and ku.

7. Check in the pre-built data (icudtl.dat) shared by all non-Android
   platforms and assembly files for Linux/Mac

The final data size is 10,255,584 bytes, which is about 200kB smaller than
that for ICU 52.1.  The pristine upstream ICU has the data of
25,343,024 bytes.

The remaining steps are to build a smaller data file for Android and
to build icudtl.dll for Windows (non-default build option).

BUG=428145
TEST=net_unittests --gtest_filter="*ilenameUtil*"
TEST=net_unittests --gtest_filter="*IDN*"
TEST=base_unittests --gtest_filter="*Conv*"
TEST=browser_tests --gtest_filter="*ncoding*"
TEST=Blink: layout tests
R=mark@chromium.org

Review URL: https://codereview.chromium.org/872903002