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Before this CL, activation for prerendering navigation is avoided by the
order of prerender start and map insertion in
PrerenderHostRegistry::StartPrerendering().

After this CL, it's explicitly avoided by checking
RenderFrameHostImpl::IsPrerendering() in
PrerenderHostRegistry::SelectForNavigation().

Bug: 1132746
Change-Id: I112cab26f6abd004554ef0033613ee5e919c5552
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626683Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843044}