Only add navigations that affect user-facing history to visited URLs.

We want to avoid adding anything that isn't in the primary page
to the visited URLs. So fenced frames won't count as a visited URL navigation.

BUG=1218946

Change-Id: If8bba1bedda2e96c7d97731f5b237c80c6e3f660
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3749037
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Bo Liu <boliu@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1021273}