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This CL migrates the Chrome OS JSON config for the Google Docs
preinstalled web app (located here [0]) up into the Chrome binary.

This default web app is going to be used by Chrome Windows/Mac/Linux
so this CL is deduping the offline data into one place.
A separate CL will clean up the redundant JSON config.

[0]: https://chrome-internal.googlesource.com/chromeos/overlays/chromeos-overlay/+/master/chromeos-base/chromeos-default-apps/files/web_apps/docs.json

Bug: 1104692
Change-Id: I4f713bf1dec230fe4c6f3c691d4d954ac0c5f340
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2524809
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825697}