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This is no longer necessary now that we track RenderFrameProxyHosts.
This CL also cleans up many other references to "swapped out."

Bug: 1015882
Change-Id: Ib5391d360460540945891232c5eca0701fce138f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022350
Commit-Queue: Charlie Reis <creis@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736480}