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See crbug.com/1106284#c1 for screen shots.

If a PWA is showing the download shelf when it navigates away and the
theme changes, we must notify that the theme has changed in order to
redraw the download shelf correctly. This is required for all PWAs,
not just those with tab strips.

Bug: 1106284
Change-Id: I43a18cb578ee9ef8870a7bc602b373b16c3c52a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306492
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790563}