Revert of Use ChannelMojo between the remoting daemon and network processes.

remoting/base/auto_thread_task_runner.h

Index: remoting/base/auto_thread_task_runner.h
diff --git a/remoting/base/auto_thread_task_runner.h b/remoting/base/auto_thread_task_runner.h
index 37972fe43c1da44ecc2459bc2e0ed307cef62591..e8efe97c82026ac3068d486e998b93f7bdd352bc 100644
--- a/remoting/base/auto_thread_task_runner.h
+++ b/remoting/base/auto_thread_task_runner.h
@@ -34,10 +34,6 @@
                                   base::TimeDelta delay) override;
   bool RunsTasksOnCurrentThread() const override;
 
-  const scoped_refptr<base::SingleThreadTaskRunner>& task_runner() {
-    return task_runner_;
-  }
-
  private:
   ~AutoThreadTaskRunner() override;