Remove IOObservers from MessageLoopForIO.
IOObservers aren't used anywhere.
We plan to redirect Tasks that run on the CACHE thread's
MessageLoopForIO to the new base/task_scheduler API. For
that, we have to replicate MessageLoopForIO's features in
base/task_scheduler. Removing features that aren't used
will make this easier.
BUG=553459
Review-Url: https://codereview.chromium.org/1950633002
Cr-Commit-Position: refs/heads/master@{#392466}
CrOS-Libchrome-Original-Commit: 1d49f3c45fba20437ccaba796784deb3d5242e76
4 files changed