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There are several uses of |privates| in the guest view js that are used
as if it were a means of making properties inaccessible from outside a
class (like what private does in C++). |privates| only hides
properties from outside the extension system implementation.

We remove uses of |privates| where the receiver is already inaccessible
from outside the extension system implementation.

Bug: 900940
Change-Id: Ib583aefe9daa22e095d387ffab430429870796fc
Reviewed-on: https://chromium-review.googlesource.com/c/1336052Reviewed-by: Paul Meyer <paulmeyer@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611354}