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This CL enables PWA manifest updating to detect when sites update the
scope field.

Bug: 926083
Change-Id: Ib304ef830c215f564c64cf55c0d978308e2524e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1921012
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716085}