- Remove the reply_port from the VM internal message object.

runtime/vm/message.h

Index: runtime/vm/message.h
===================================================================
--- runtime/vm/message.h	(revision 31195)
+++ runtime/vm/message.h	(working copy)
@@ -29,13 +29,9 @@
   // A new message to be sent between two isolates. The data handed to this
   // message will be disposed by calling free() once the message object is
   // being destructed (after delivery or when the receiving port is closed).
-  //
-  // If reply_port is kIllegalPort, then there is no reply port.
-  Message(Dart_Port dest_port, Dart_Port reply_port, uint8_t* data,
-          intptr_t len, Priority priority)
+  Message(Dart_Port dest_port, uint8_t* data, intptr_t len, Priority priority)
       : next_(NULL),
         dest_port_(dest_port),
-        reply_port_(reply_port),
         data_(data),
         len_(len),
         priority_(priority) {}
@@ -44,7 +40,6 @@
   }
 
   Dart_Port dest_port() const { return dest_port_; }
-  Dart_Port reply_port() const { return reply_port_; }
   uint8_t* data() const { return data_; }
   intptr_t len() const { return len_; }
   Priority priority() const { return priority_; }
@@ -56,7 +51,6 @@
 
   Message* next_;
   Dart_Port dest_port_;
-  Dart_Port reply_port_;
   uint8_t* data_;
   intptr_t len_;
   Priority priority_;