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This CL adds the ability to hide the app icon view in Message Center's
NotificationHeaderView. This allows the Global Media Controls dialog to
hide the unnecessary Chromium icon that appears before the URL.

Bug: 1011047
Change-Id: Ic3e5a8e57ecfc14698697370e4fc0d5840c28ff0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875276Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708760}