GitLab

Rename it to WebAppDataRetriever.

Modernize: Use BindOnce.

Bug: 875698
Change-Id: I4bf74a2966642f606f0ed602bc5bc7d72466e1da
Reviewed-on: https://chromium-review.googlesource.com/c/1256404Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596525}