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.

[email protected]

Bug: 714018
Change-Id: I5d3dabe31b239acb3e4ba6db7527fda5a3cd5f4a
Reviewed-on: https://chromium-review.googlesource.com/c/1475635
Auto-Submit: kylechar <[email protected]>
Reviewed-by: Yuwei Huang <[email protected]>
Commit-Queue: Yuwei Huang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#632735}
85 files changed