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This matches Chrome in that the url bar is shown at the start of every navigation if it was hidden. It will stay visible for non committed navigations (again matching Chrome), but allows the user to scroll up to hide it.

Also fix this for the failed-load case.

Bug: 1127937
Change-Id: I6b91a1ae17a02f5340c5160f048b77d190e4b28d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415673Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807996}