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Before this change instances with outstanding flush() promises might
have been collected and destroyed by JS GC.

Bug: 1148159, 1146170
Change-Id: I4a49deab447ad79e4d2c4022968af6d5e6d4b5d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2546170
Commit-Queue: Eugene Zemtsov <eugene@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829027}