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This CL converts the paths that read and decompress thumbnails to use
base::OnceCallback and base::BindOnce instead of the generic base::Bind
and base::Callback.

It also notably changes a base::RepeatingCallback that seems to only be
called once into a OnceCallback.

Bug: 1152271
Change-Id: Ibc9cb6004c6a66c27225ea8ecda210f59f288f8b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572746Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834091}