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Manifest v3 and higher extensions will not have access to the
chrome://favicon host; instead, we'll provide a dedicated API
permission and different URL. This results in being able to
tighten our permissions around the chrome:-scheme.

Bug: 104102

Change-Id: I0610caa036e4488d8d5a439396036a9497961f46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441195Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815778}