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Now WebEngine implements SetPermissionState() which allows to grant
permissions for web features.

Bug: 922833
Change-Id: I356e54646ad870bb7882a5b9a95bc87deccba453
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2058086
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749428}