run phantom handle callbacks first
run phantom handle callbacks first

BUG=

Review URL: https://codereview.chromium.org/1034473002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27408}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh