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Previously, if navigating a link did not cause a url change (e.g. clicking on the `stackoverflow` logo on the `stackoverflow.com` homepage reloads the same page), then the display url remained unchanged. If the user had deleted or edited the url, his changes would remain. Now, the url is reset.

Bug: 830491
Change-Id: If1aa07715175d7d5bd5b12a65d9e1d9529aca3b5
Reviewed-on: https://chromium-review.googlesource.com/1103233
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568831}