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A followup to http://crrev.com/c/1673566.  Strip our restore and placeholder
information out of the URL returned by GetCurrentURL().

Change-Id: I86075a81099fca5bc74f6fabcb44c4faad216f9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1677804
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672575}