Backed out changeset 4d8d4fd97c4f - bug 543764, because of deadlocks.

ipc/glue/AsyncChannel.cpp

@@ -294,15 +294,6 @@ AsyncChannel::NotifyChannelClosed()
 void
 AsyncChannel::NotifyMaybeChannelError()
 {
-    // OnChannelError holds mMutex when it posts this task and this task cannot
-    // be allowed to run until OnChannelError has exited. We enforce that order
-    // by grabbing the mutex here which should only continue once OnChannelError
-    // has completed.
-    {
-        MutexAutoLock lock(mMutex);
-        // Nothing to do!
-    }
-
     // TODO sort out Close() on this side racing with Close() on the
     // other side
     if (ChannelClosing == mChannelState) {