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This fixes a bug where text fragments in the URL are not matched in the
page because spaces (and other special characters) are still URL-
encoded.

It also terminates early if no text fragment could be parsed, to avoid
needless JS calls.

Bug: 1099268
Change-Id: I3a135a4804bc57cde6ef1b1cc22785016507db53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422724
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809104}