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This CL adds extra logging to NavigateToURLInSameBrowsingInstance that
was blamed for the first failed test assertion in the log stored in
https://crbug.com/859487#c3.

This CL doesn't contain any actual fix for the flakiness, but reenables
the test anyway, because
1) the test passed 50 times when run locally
2) hopefully the extra logging will help diagnose the flakiness if the
   test starts flaking again on the bots

Fixed: 859487
Change-Id: I90caf66b0ffbbd341a5c8cd00a5605d509aa31d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390998
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804327}