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It is safe not to if ~RunLoop happens-after Quit() (or if the loop never
ran). Off-thread destruction happens sometimes in RefCountedThreadSafe
objects after the loop was quit (see failures on patch set 1).

Bug: 715235
Change-Id: If3d6e3661d9bc00547ac5606075b3fe066ff3e7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1671868
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683386}