Use base::BindOnce for PostTask callbacks.

TaskRunner::PostTask() takes a OnceCallback. Replace usage of
base::Bind(), which produces a RepeatingCallback, with base::BindOnce()
when the callback is created as a temporary inside of PostTask(). The
following regex was used to find instances that could be replaced:

(Post(?:Delayed)?Task)\((?:\n\s*)?FROM_HERE,(?:\n)?\s*base::Bind\(

Also replace any usage of base::Passed(&var) with std::move(var) for
variables passed to base::BindOnce(). base::Passed() isn't needed for
move-only types with OnceCallbacks.

This CL was uploaded by git cl split.

R=rdevlin.cronin@chromium.org, tbarzic@chromium.org

Bug: 714018
Change-Id: Ib2c129a60744c0030a2d2ab5b3947d2a8b7c4b27
Reviewed-on: https://chromium-review.googlesource.com/c/1475735
Auto-Submit: kylechar <kylechar@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633246}
28 files changed