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(Fix was to make SingleRejectPrerequisitePolicyALLModified not use
RunUntilIdle)

Original patch: https://crrev.com/c/1640639

The idea (thanks Etienne) is to not retain any prerequisites (including
curried ones) until they've settled.  This fixes ref counting cycles
while ensuring results are retained for dependencies.

This patch also changes the way curried promises are handled which was
necessary to break refcounting cycles. Now when a promise resolves or
rejects with a promise, its dependents are modified to use the curried
promise as their prerequisite instead.

TBR=fdoray@chromium.org

Bug: 968302, 906125
Change-Id: I1532faff6fe4f55dc236210389db62eb6a03212f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1680264Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Commit-Queue: Alex Clarke <alexclarke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673293}