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After forcing tests to fail after a 10 seconds timeout, turns out the
spy promise tests are the culprit.
I have removed them from our tests as they are originally intended to
test XHR's and we now have a better API for that.

BUG=504204

Review URL: https://codereview.chromium.org/1633273002

Cr-Commit-Position: refs/heads/master@{#371658}