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Fix NavigationControllerBrowserTest.SubframeForwardRedirect with PlzNavigate and site isolation enabled.

The problem is that NavigationRequest::dest_site_instance_ is set in the constructor of that class. If RenderFrameHostManager::CanSubframeSwapProcess determines that a cross process redirect should happen for the subframe (because of site isolation) then we might need to use a new site instance.

BUG=674734
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2594263004
Cr-Commit-Position: refs/heads/master@{#442053}