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This is a reland of cd5b76ea.

PrerenderBrowserTest.PrerenderWindowSize still failing after revert.

Original change's description:
> Allow navigations to opener's site to go back into opener SiteInstance.
>
> Previously, when a popup and its opener were cross-site, and neither
> site required a dedicated process, navigating the popup back to the
> opener's site did not swap processes, so the two ended up in different
> processes and couldn't script each other.  Even though
> DetermineSiteInstanceForURL contains logic to place same-site popups
> into their opener's SiteInstance (added as part of the fix for a
> similar issue 796912), this logic was never reached because we never
> attempted a process transfer in this case, thanks to
> IsRendererTransferNeededForNavigation() returning false.
>
> This CL tweaks IsRendererTransferNeededForNavigation so that a
> cross-process transfer is always attempted is such cases.  This allows
> DetermineSiteInstanceForURL to always place the popup that's going back
> to its opener site into the opener's SiteInstance.
>
> Bug: 807184
> Change-Id: Ia4d8d8b2107d3b9e3b9329dd473c06d49b7bd5ec
> Reviewed-on: https://chromium-review.googlesource.com/894369
> Reviewed-by: Charlie Reis <creis@chromium.org>
> Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#533410}

TBR=alexmos@chromium.org

Bug: 807184, 807821
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I7808cef9292ff069bcfdd00fe71883d321d7f577
Reviewed-on: https://chromium-review.googlesource.com/897262
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533588}