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As described in https://crbug.com/917457#c17 enabling the feature should
not cause any issues in the wild.  At the same time, enabling the
feature should make a significant improvement in the protections that
Chrome offers against compromised renderers.

Bug: 917457
Change-Id: I53856a9f3a9851b5907c5805ce0544a56b7eb87b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2350881Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Auto-Submit: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798414}