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Use UpdateWebAppInfoFromManifest to merge the manifest into info.

In next CLs:
1) Add scope and theme_color into WebApp.
2) Download icons and write them to disk.

Bug: 901226
Change-Id: I3439983ef06c8c1bed5223ba2127a8620f1e4b55
Reviewed-on: https://chromium-review.googlesource.com/c/1319391
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605929}