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This enum is only applicable to obsolete InputMethod.ID histogram that's
been deprecated since M46. Therefore it should have been marked obsolete
together with the histogram's deprecation 6 years ago (July 2014, see
https://crrev.com/254e75d880369bf49bdf0e8ccc400ab71f6f2fee).

The enum ID needs to be marked obsolete (and not removed), as per UMA
guidelines to avoid inadvertent reuse that causes confusion in future.
Enum etries can however be completely cleaned up, because InputMethod.ID
was a sparse histogram (not an enum histogram) and these reverse
mappings from numerical values to labels aren't exhaustive anyway.
These removals are akin to adjusting the labels to 'unknown'.

These removals only make interpretation of old data inconvenient. It's
however unlikely we'd need to analyse data of deprecated InputMethod.ID
metric that's no longer been recorded for the past 6 years. In the
highly unlikely event we need to do so, repo history is at our disposal.

Bug: 1150183
Change-Id: I3f274c038be1b334a4e49ccbef3bae518ede0019
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2546345Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Jing Wang <jiwan@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Bao-Duy Tran <tranbaoduy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829569}