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HashTable with Member had a data race that required adding an atomic
ctor for Member via ConstructTraits. It was not needed for WeakMember
because weak HashTables were traced only on mutator thread. Now these
tables can be traced concurrently so the same data race can occur for
WeakMember as well.

Bug: 986235
Change-Id: Ic54167be0dbcbb025b136ee023929125b1a33c55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352922
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798119}