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Don't auto allow access to media devices unless a the security origin of the requester is the same as its ancestors.

This adds a field in MediaStreamRequest to verify that the security origin of the requester is the same as its ancestors.
This field have to be set on the UI-thread and is therefore set just before sending the request to the UI.

BUG=448378
TEST= please see bug report

Review URL: https://codereview.chromium.org/795703003

Cr-Commit-Position: refs/heads/master@{#313904}