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1) Avoid using 'us' as password layout for those layouts can be remapped to 'us'.
2) Norwegian decoding language should be 'no', and password layout
should not be no.compact.qwerty instead of us.compact.qwerty.
3) Korean 2set IME can use m17n:ko_2set layout.
4) Korean IMEs OSK url uses hash to support fast switching.

BUG=416504
TEST=Verified on linux_chromeos.

Review URL: https://codereview.chromium.org/646863004

Cr-Commit-Position: refs/heads/master@{#299070}