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* Explicit deletion of copy constructors not necessary when move
  constructors are given.
* No way to check if the runner had a closure inside.
* RunAndReset() crashed if called with no closure inside.
* operator=() failed to run the outgoing closure.

Bug: none
Change-Id: I8c92dfaca95619fe6661af10c018a75dae7e25ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537787
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827526}