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mus should no longer host viz for browser_tests --mus. So it should not have
--mus=viz flag set. With this change, the browser_tests no longer need the
filter file. So remove it (from main and fyi waterfalls).

BUG=786453, 785536

Change-Id: Ia9ecfdc8f667bb07cf53debbc98f960938f6d452
Reviewed-on: https://chromium-review.googlesource.com/812169Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522341}