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The OWNERS files for our implementation of the App Manifest spec
reference the Manifest component, which does not exist in Monorail. This
CL replaces it with the valid Blink>AppManifest component.

Change-Id: Idb413ae22e00003c53847b4c924b189c2c46fa37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040385
Auto-Submit: Victor Costan <pwnall@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738846}