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Partial reland of https://chromium-review.googlesource.com/c/chromium/src/+/1635827

Extracted HasTraits() modification to make revertable part of the
desired change as small as possible.

TBR=fdoray@chromium.org

Bug: 968047
Change-Id: I9683326cceee53164e4482d71cf6929296a8db7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762332
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688682}