Ensure that in-flight message pipes are always closed and the other end is notified.

mojo/edk/system/raw_channel.cc

Index: mojo/edk/system/raw_channel.cc
diff --git a/mojo/edk/system/raw_channel.cc b/mojo/edk/system/raw_channel.cc
index 34f0c1c7445c94b8673a12ab518124b65b6ec57b..5d0a04c47273dfddbfaa8c02f66bac8b4bd11205 100644
--- a/mojo/edk/system/raw_channel.cc
+++ b/mojo/edk/system/raw_channel.cc
@@ -649,7 +649,8 @@ void RawChannel::DispatchMessages(bool* did_dispatch_message,
       return;  // |this| may have been destroyed in |CallOnError()|.
     }
 
-    if (message_view.type() != MessageInTransit::Type::MESSAGE) {
+    if (message_view.type() != MessageInTransit::Type::MESSAGE &&
+        message_view.type() != MessageInTransit::Type::QUIT_MESSAGE) {
       if (!OnReadMessageForRawChannel(message_view)) {
         CallOnError(Delegate::ERROR_READ_BAD_MESSAGE);
         *stop_dispatching = true;