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In general, IDL prohibits to use keywords as identifiers.
But the spec defines some places; arguments, operation names,
and attribute names.

This CL makes our IDL parser to be more consistent with
current spec, and also updates few IDL files that can be
consistent with their specs with this change.


Bug: 839389
Change-Id: I60802ae211c3dffd4e9f3a76ad5dd2a3910791a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855623Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705131}