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This is a reland of e0309342

Original change's description:
> Policy WebUI: 'Reload Policies' button reloads google update policies
>
> Bug: 1119703
> Change-Id: Ib91b37dc1da4f06782caea7b67ecc6d0c8c87b2d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367673
> Commit-Queue: Yann Dago <ydago@chromium.org>
> Reviewed-by: Owen Min <zmin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#802644}

Bug: 1119703
Change-Id: I0542a481dc512b1c214e050084114cf313c10baf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382216Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Yann Dago <ydago@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803150}