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This reverts commit b7e58d9d.

Reason for revert: Introduced regression issues relating to omnibox text being cleared.

Original change's description:
> omnibox: reset display url when re-navigating to the current page by clicking a link
> 
> 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}

TBR=tommycli@chromium.org,manukh@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 830491
Change-Id: If20093795454513c9734fa2c8ed686843e83a683
Reviewed-on: https://chromium-review.googlesource.com/1113879Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570165}