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The current test waits for the download to be completed but we still
need to verify the CRX as the first step and the test often returns the
run loop earlier than that

Change-Id: I52f163539c4f49b3ffc348346d23d43f510ef461
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585304Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835760}