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When using BEST_EFFORT, the CDM is registered pretty late that browser tests
are failing, and if we specify a site playing encrypted media on command line,
the site will find Widevine not supproted (because it's not registered yet).

This CL changes the task priority to be USER_VISIBLE to solve this issue.

Bug: 900169
Test: Failing tests are passing now.
Change-Id: I8530048a07d804f5d99637745a8b7db0851ff221
Reviewed-on: https://chromium-review.googlesource.com/c/1308974
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604285}