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This reverts commit 03844362.

Reason for revert: heap-snapshot-with-multiple-retainers.js no longer flaky. See https://chromium-review.googlesource.com/c/chromium/src/+/1546939
TBR=pfeldman

Change-Id: Ie6917ebadb843c3c0b025a8113345cc9c8994011
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1548048Reviewed-by: Johannes Henkel <johannes@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646503}