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This clarifies, and better documents the side effects of using the
WebContents capture notification APIs. This is a follow-up task from a
recent post-mortem discussion.

Bug: 1144868
Change-Id: I1a55025df42e85578b7d6200e1b38a151157ab6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611912
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Collin Baker <collinbaker@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Auto-Submit: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841244}