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Proposed new name found in http://go/cros-input-methods
Rationale: http://go/cros-input-methods-naming

Current view for US International: http://screen/3sankWPvq6xQW2R
New view for US International: http://screen/BrfNpMZn7GYzS5h

Current view for Belgium: http://screen/B9USEaX8iX2JuTp
New view for Belgium: http://screen/4A4hVAMrK62JP2z

Remove adding language before input name logic as there are no longer
duplicate names for IME tray.

It's fine not to update string for OOBE for now because it's clear
what language the keyboard is referring to.
OOBE view: http://go/cros-oobe-2019#slide=24

Bug: 1113439, 889763
Change-Id: Ia7dadd44874937872c1f10fa51ca81e344378ed6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423068Reviewed-by: Shu Chen <shuchen@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809639}