mash: Make sure the app-manifests for chrome gets built.
mash: Make sure the app-manifests for chrome gets built.

BUG=594419, 601983

Review URL: https://codereview.chromium.org/1870393002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#386528}

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