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Trying to initialize it causes content_shell --enable-browser-side-navigation
to crash on startup.

It corresponds to ResourceRequestInfo::GetVisibilityState, but that's only used
for categorizing requests made from prerender which needs a different bit
(WebPageVisiblityStatePrerender vs. others), so we'll need to revisit it
anyway.

BUG=376014

Review URL: https://codereview.chromium.org/534393002

Cr-Commit-Position: refs/heads/master@{#293211}