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This is used by ContentSettingsAgentImpl to query for storage
permissions in the browser process.

Bug: 1065537
Change-Id: Idd8176bf801c6636559304c6d23ce6c6b1237405
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145257
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759436}