Chromium change: https://chromium.googlesource.com/chromium/src/+/89a5f3ab57a994cd2652c45475c4b83895a40a94 commit 89a5f3ab57a994cd2652c45475c4b83895a40a94 Author: John Abd-El-Malek <jam@chromium.org> Date: Fri Jun 14 18:21:53 2019 +0000 Remove IOThread class as it's not needed anymore. Bug: 934009