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Permission overrides were implemented for the automation purposes
(WebDriver, Puppeteer, Playwright, etc). Before this change, protocol
required concrete |origin| to be specified in order to override the
permissions. This change makes this |origin| input parameter optional
and allows global permission override within the given browser context.

TBR=mlamouri for updating chrome/ due to changes in content/ semantics.

Change-Id: I35e78307643b179a46e296d81f261e5b596c6252
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095668
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750221}