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The new icon, same as the other preview icons, is simpler and smaller.

This CL implements the UI mocks, specifically:
* New speedometer icon
* No enabled/disabled shading
* 24dp instead of 32dp

Bug: 909915
Change-Id: Icf4aed99869986b8e285a14e3179e7a054584667
Reviewed-on: https://chromium-review.googlesource.com/c/1481795Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634679}