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Using chrome://theme/current-channel-logo, which does not work on
iOS and Android.

Bug: 820678
Change-Id: I5b0028bd75dd52c55359264b7d72e8cd04d4be9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1588799
Commit-Queue: Peter Boström <pbos@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807474}