GitLab

Contain all FilesApp foreground access to the background
object to the FileManager class.

This simplifies a lot of the externs dependencies and
I think it provides a cleaner API.

Change-Id: I96716d0c53d538a90adfb04f9f54ce6cd7d72568
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761880Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688460}