- Add missing half-width kana entries (omitted by mistake)
- Drop 'extra' decoding only mapping. See
  https://www.w3.org/Bugs/Public/show_bug.cgi?id=25266
- Regenerate icu data files (*dat and assembly source files) for Linux,
  Mac, Windows and Android.  (they'll not be shown at
  codereview.chromium.org because they're too large).

BUG=132145,78847
TEST=When ICU is rolled in, base_unittests --gtest_filter=*ICU*
and layout tests

R=jsbell@chromium.org

Review URL: https://codereview.chromium.org/251203003

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/icu52@266919 4ff67af0-8c30-449e-8e8b-ad334ec8d88c