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Reuse sync WebAppSpecifics in web_applications code.
This works much better than a comment with a requirement to keep protos/enums
in sync.

Bug: 860583
Change-Id: I8fc532c28ae8588608032cf751cc3ad44f26f31b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1818882Reviewed-by: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699245}