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Extensions management page has a new UI.
Current screen shots of page are outdated.
This CL updates the screen shots in the Get Started Tutorial
to match the new UI.

Bug: 824766
Change-Id: Ie7028dbbe44663eaabf56fec2356c42ac7fbe102
Reviewed-on: https://chromium-review.googlesource.com/975664Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Crystal Lambert <crystallambert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545084}