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Removes the round-rect end caps in favor of a rectangular throbber.

The throbber size and timings are also updated. See chromium:907435.

Bug: chromium:907422, chromium:907435
Change-Id: I7d7a18a4d19b18361db84de829a93475a57efa44
Reviewed-on: https://chromium-review.googlesource.com/c/1346091Reviewed-by: Edward Jung <edwardjung@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610083}