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Full- and partial-screenshots are restricted if any restricted for screenshots data is visible.
Window-screenshots are restricted if the window contains any restricted for screenshots WebContents.

Bug: 1109723
Test: Manual, new unit/browser tests being added.
Change-Id: I62bd96f39706b13ef4468d78b0ce9258699c985f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317961Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Nikita Podguzov <nikitapodguzov@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796229}