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<link rel=next> is expected to trigger prerendering like
<link rel=prerender>.

Note that when the feature flag `kPrerender2` is disabled,
<link rel=next> triggers NoStatePrefetch.

Bug: 1155925
Change-Id: If430701e125dcc55e9bded8350dcc43eed8a1a1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2578499Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836533}