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The `window.opener` might be storing a reference to `window.navigator.credentials`,
and call methods on it after the opened `window` is navigated away and hence its
relevant settings object's responsible document is already destroyed.

We should ignore calls to navigator.credentials methods in this case and not crash.

Bug: 797900
Change-Id: I6507cb30b8d9d967a1d218135388fc833d215c69
Reviewed-on: https://chromium-review.googlesource.com/848914Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527004}