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    U+0E1E (พ) => w
    U+0E9E (ພ) => w
    U+0E9F (ຟ) => w

    U+0EA3 (ຣ) => s
    U+0EAE (ຮ) => s

    U+0E1A (บ) => u
    U+0E9A (ບ) => u

    Note that U+0E1F(ฟ) and U+0E23 (ร) were added a while ago.

BUG=833143
TEST=components_unittests --gtest_filter=*IDN*

Change-Id: I882e7d272cdca1d80aa23be94b4d7906ff8653c1
Reviewed-on: https://chromium-review.googlesource.com/1058710Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562565}