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[Activity Log] Use await for activity log history browser test

use await instead of promise chaining for activity log history browser
tests. This should make the tests more readable and it reduces nesting.

Bug: 945422
Change-Id: I75ed11a26c952ca72db305f48637d9d2bc7178af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1694266Reviewed-by: Esmael El-Moslimany <aee@chromium.org>
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676092}