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See https://bugs.chromium.org/p/chromium/issues/detail?id=613096#c5 for
rationale

These two files:
third_party/closure_compiler/externs/accessibility_private.js
third_party/closure_compiler/externs/autofill_private.js
were updated in this commit, as an example of the change.

A follow-up commit will update other *_private.js files.

Bug: 613096
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Ica4ab471956052b37c8bb6a9aabe4a7502408cfb
Reviewed-on: https://chromium-review.googlesource.com/1090425
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568702}