Roll ICU d319ad9e25e80:009e7a78d921
Roll ICU d319ad9e25e80:009e7a78d921

1. Update the mapping tables for EUC-KR, Shift_JIS, Big5, and EUC-JP.

2. Set U_CHARSET_IS_UTF8 to 1 to cut down the code size.

See https://codereview.chromium.org/984233002 for details.

BUG=450312,430823
TEST==base_unittests --gtest_filter=*Strin*, browser_tests --gtest_filter=*ncoding*
TBR=jsbell@chromium.org

Review URL: https://codereview.chromium.org/1026523002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#321650}

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