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I was suggested the "isolate" argument of ReportCoopAccess could be
determined by the DomWindow instance itself:
https://chromium-review.googlesource.com/c/chromium/src/+/2339353/4

This patch removes it from the ReportCoopAccess method and updates the
callers.

Bug: 1090273
Change-Id: I0286f13ea8700c419728f89f706baf71bb0f0642
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346569
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796842}