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This CL fixes Browser Actions bugs includes:
1. Change download menu text to "Download link".
2. Fix flaky test.

Bug: 773073, 831306
Change-Id: I4f2bc4d9288c2d96b7d878eb80ac0802e8065fe3
Reviewed-on: https://chromium-review.googlesource.com/1091875Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Lei Tian <ltian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565718}