GitLab

Due to lifecycle issues with the presentation API it is easier to
ensure that the objects it creates are garbage collected and we can
copy the lists before iterating on them.

BUG=960785

Change-Id: I06fe61d0465fa36e16a3defa7b06a32b220b05c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1645813
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666443}