Roll icu to 257461

Roll icu to 257461

From https://codereview.chromium.org/201133002/

Add the minimal Tajik locale data and update tz data

1. Add the minimal Tajik locale (exemplar character sets and script) for
for Tajik spellchecking

2. Update the timezone data to 2014a (the latest as of today)

3. Drop tranlsiteration files for case changes except for el_Upper.txt because
all others (Turkic and Lithuanian) are covered by ICU's case changing API
without relying on the transliterator. Blink was already changed to use the regular ICU case changing API except for Greek uppercasing for which transliteration (el_Upper) is used.

4. Rebuild icudtl.dat for non-Android and Android
(for build icu_use_data_file_flag=1) as well as the assembly source
files for Linux, Mac and Android (icu_use_data_file_flag=0).

icudt.dll for Windows (icu_use_data_file_flag=0) is not updated in this CL.
We don't need it because icu_use_data_file_flag=1 on all platforms now. Just in
case, I'll update that in a separate CL.

TBR=rouslan
BUG=349194
TEST= webkit_unit_tests:WebFrameTest.SelectRange*, wtf_unittests:*String*Locale* base_unittests:*String*, net_unittests:*IDN* as well as layout tests (esp. fast/text/text-transform-* )

Review URL: https://codereview.chromium.org/199863004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257609 0039d316-1c4b-4281-b951-d872f2087c98