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This CL adapts the guest mode avatar to an updated design.

Bug: 967317
Change-Id: Iccfd4c665238fe5731c52126a4c914c736d3ece0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810979
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: Thomas Tangl <tangltom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697752}