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The web app installability check now verifies that the entire web app
manifest scope is within a service worker's scope, instead of simply
checking the start url.


Bug: 809837
Change-Id: Ia4a957aae3e3d1737401376d2188c6f8dd85837e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1799649Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696003}