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Use it in WebLayer so that its download notifications match Chrome. Also remove DownloadUtils.getStatusString which was unused.

Bug: 1025603
Change-Id: I09d3ff636a750ad32188f8e0c4dddbb84448a7ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2136891Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756777}