Change 'big5' to 'Big5'

Change 'big5' to 'Big5'

Some layout tests and chrome browser tests compare the encoding labels
case-sensitively. Fixing them all takes a while. In the meantime,
change the ICU alias table to use exactly what they expects (Big5).

Also drop big5-hkscs from the alias for Big5 for now. They'll be
unified in another CL.

See the layout test failures for PS #2 at https://codereview.chromium.org/649413002

BUG=412053
TEST=browser_tests --gtest_filter=*ncoding*
TEST=Layout tests : http/tests/misc/char-encod*, fast/encoding/*
R=jsbell@chromium.org
TBR=jsbell@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=292476

[jungshik at Google, 2014-10-15 00:35:16]

jshin@chromium.org changed reviewers:
+ jsbell@chromium.org

[jsbell, 2014-10-15 00:47:59]

lgtm

[jungshik at Google, 2014-10-15 18:53:25]

Committed patchset #1 (id:1) manually as r292476 (presubmit successful).