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The Crostini Installer spec uses a mascot icon without a background rather than
the version with the background circle and shadow.

This adds the mascot for use in the WebUI Installer.

Bug: 867117
Change-Id: Id56d65c625e86f085e43d067b89395fa669c7012
Reviewed-on: https://chromium-review.googlesource.com/c/1319393Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Josh Pratt <jopra@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606680}