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Now that we have 'Noto Sans Mono CJK {JP,KR,SC,TC}', we'd better set them to the default monospace fonts for CJK.

Two related CLs:

  https://codereview.chromium.org/1134853002
  https://chromium-review.googlesource.com/#/c/269899/

BUG=486164
TEST=The following uses Noto Sans Mono CJK JP instead of Motoya
  data:text/html,<span lang="ja" style="font-family: monospace">ABC123</span>

Review URL: https://codereview.chromium.org/1127313012

Cr-Commit-Position: refs/heads/master@{#330141}