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The service_ pointer was getting nulled-out asynchronously, so we'd
sometimes reject early based on the service_ being null and sometimes
pass that check and reject with no user gesture.

The fix makes things consistent but not yet spec compliant - issue
962991 will make things spec compliant.

Bug: 962685
Change-Id: I69bae46f02e0027ef69365c1c8c47d72af0dee3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1630719Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664383}