GitLab

Mostly, converts typedef -> using per style guide. Also uses
CallbackList::CallbackType more (and more systematically), and some
other misc. cleanup like using stl_util.h, explicitly declaring types
more, etc.

Bug: none
Change-Id: I63241972f5bede0c1cdb85ade8a0ba1155979cf9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354621
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Orin Jaworski <orinj@chromium.org>
Reviewed-by: John Wu <jzw@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798656}