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Currently we assume that if a NavigationContext can be found when
"decidePolicyForNavigationAction" is invoked, the navigation should be
either user-initiated or JS back-forward. However this can be wrong if
the web page uses JS to load the same URL during the navigation. The
root cause here is that we are matching URL to find the
NavigationContext for WKNavigationAction, which is not reliable.

Bug: 1000309,1003467
Change-Id: I7163474df5ffde9cf784ef348f48e652ca878df3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1807832Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697511}