tree 604308b76d9fe4b4a9c4dadd64d0a01fb114d31e
parent 080acb0967ec06504808de9a25f64290df3d6128
author Makoto Shimazu <shimazu@chromium.org> 1570428108 -0700
committer Chromium WPT Sync <blink-w3c-test-autoroller@chromium.org> 1570428108 -0700

Wait for a promise returned by reg.unregister() in wpt

add_completion_callback() doesn't wait for settling a promise. This replaces it
with promise_test().

R=yhirano@chromium.org

Bug: none
Change-Id: I58f4dceacbad533390997e55610875376e9f63ae