Fix comment in scoped_task_environment.h.

The main thread doesn't pump +system+ messages.

R=gab@chromium.org
TBR=gab@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2847773002
Cr-Commit-Position: refs/heads/master@{#467700}


CrOS-Libchrome-Original-Commit: 5d1496cb9aab8adfd300df7c8dfe1e059100048a
1 file changed
tree: c705439d81ce600d68e9fe9850b716def691a36e
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/