Replace HeapListHashSet with HeapLinkedHashSet in HitTestResult

HeapListHashSet is deprecated in favor of HeapLinkedHashSet.

HeapLinkedHashSet's invalidate iterators when the container is
modified.  This does not happen in this usage, so
replacement is simple.

R=jbroman@chromium.org
CC=​blink-reviews-vendor@chromium.org

BUG=614112

Change-Id: Iaa3078f250361a003bca35326c79d1af9b9b62af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584899
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654191}
1 file changed