EDK: Make TransportData preserve handle rights.

mojo/edk/system/message_in_transit.h

Index: mojo/edk/system/message_in_transit.h
diff --git a/mojo/edk/system/message_in_transit.h b/mojo/edk/system/message_in_transit.h
index f2ec0262b9fe7bdda18796bd8fb6ed9ae5b0d0b2..654311e0ac7a310c139d1f5196d7ec37ec95bf30 100644
--- a/mojo/edk/system/message_in_transit.h
+++ b/mojo/edk/system/message_in_transit.h
@@ -14,7 +14,6 @@
 
 #include "mojo/edk/platform/aligned_alloc.h"
 #include "mojo/edk/system/channel_endpoint_id.h"
-#include "mojo/edk/system/dispatcher.h"
 #include "mojo/edk/system/handle.h"
 #include "mojo/edk/system/memory.h"
 #include "mojo/public/cpp/system/macros.h"
@@ -189,8 +188,6 @@ class MessageInTransit {
   // handle in the handle table), i.e., the dispatcher must have a reference
   // count of 1. This message must not already have handles.
   void SetHandles(std::unique_ptr<HandleVector> handles);
-  // TODO(vtl): Delete this.
-  void SetDispatchers(std::unique_ptr<DispatcherVector> dispatchers);
 
   // Sets the |TransportData| for this message. This should only be done when
   // there are no handles and no existing |TransportData|.