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When we cancel an existing navigation upon portal activation, we've also
been inadvertently canceling navigations initiated immediately following
the predecessor's call to activate.

We now only cancel the existing navigations. This also unearthed some
issues that occur when a navigation which started when orphaned commits.
We also fix those.

Bug: 1058455
Change-Id: I78cdb0ebf548d6b9710ab8315f232ca1179817e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2166386Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763551}