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This field is never used anywhere, other than asserting that it must
always carry value "ime" (!). All parsing and validation is unnecessary.
The field's existence is unnecessary and may hinder the flexibility for
future work. It'd better be gone in the spirit of YAGNI "you aren't
gonna need it". Note that the specs for these manifests have never been
formally specified or published anywhere. Also, this cleanup is fully
backward compat even for 3P, because the field is never really used.

Bug: 1134465
Change-Id: Ied6e1ad30a9ab6f08091a7d31a9c3f3124989a8f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592072
Commit-Queue: Bao-Duy Tran <tranbaoduy@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838589}