Revert of Re-enable ChannelMojo. (patchset #1 id:40001 of https://codereview.chromium.org/1273283002/ )

Reason for revert:
Still seeing flake on ChromeOS, and it's probably this again.

Original issue's description:
> Re-enable ChannelMojo.
>
> AGAIN! Previously reverted attempts:
>
> https://codereview.chromium.org/1262503011/
> https://codereview.chromium.org/1256473002/
>
> SyncMessageFilter is set up to properly use thread-safe
> Send channels now, so this should stick.
>
> Maybe.
>
> BUG=500019
> TBR=jam@chromium.org
>
> Committed: https://crrev.com/d34d184bd1a88043667b10cba79a5770bd2803fb
> Cr-Commit-Position: refs/heads/master@{#342484}

TBR=
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=500019

Review URL: https://codereview.chromium.org/1285463002

Cr-Commit-Position: refs/heads/master@{#342526}


CrOS-Libchrome-Original-Commit: cba509edaa5efe5a97ead7687c7cbac363d640ff
1 file changed
tree: 684badbf0d9ee676e10c1d408ae51d165422c5c0
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/