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This CL removes the restriction that a web app's manifest display mode
must be one of "standalone", "fullscreen" or "minimal-ui" in order to
participate in manifest updating.

Bug: 1095860
Change-Id: I48241e339c442f8fba341adb85012231b53391f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352457Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797972}