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We shouldn't proctively swap BrowsingInstances if the current frame has
not committed any navigation yet.
See: https://chromium-review.googlesource.com/c/chromium/src/+/2210174/16/content/browser/frame_host/render_document_host_user_data_browsertest.cc#305

Bug: 977562
Change-Id: If228976b79d6fb0e8cc99492a50c5acb65bef73e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340361
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795723}