Convert Callback to OnceCallback or RepeatingCallback in content pepper

This converts all Callback and Closures in content/renderer/pepper to
be Once or Repeating Callbacks as appropriate. It also converts most
uses of Bind() to BindOnce() or BindRepeating().

R=liberato@chromium.org, raymes@chromium.org

Bug: 953861
Change-Id: I6ce9ca521198c45fcdce366e817ab680e24a3983
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618143
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#661765}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 9d03ab685a650dc32aa651f0ac4e673b474115ee
2 files changed