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This CL fixes a process model bug which resulted in an attempt to
reuse the current process for cross-site navigations if
the current frame's process died after starting the navigation but
before receiving the response.  The problem was in an
IsRenderFrameLive() check in GetSiteInstanceForNavigationRequest(),
which incorrectly led to picking the current SiteInstance in this
case.

This check was introduced in r377920 but it's not clear if there was a
reason for adding it.  This CL removes it.

Bug: 968259
Change-Id: Ibf0dd6a6b6bf0c3a8c9192a2225ec2f5aa87c256
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1633591
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664497}