Validate MessageHeader before using

mojo/public/cpp/bindings/lib/message.cc

Index: mojo/public/cpp/bindings/lib/message.cc
diff --git a/mojo/public/cpp/bindings/lib/message.cc b/mojo/public/cpp/bindings/lib/message.cc
index 8ec188e2c798d18d7a3fca46cf863224fa04f76e..1db071f3b7373b9a8aa2c4983a0f29f76938c6a0 100644
--- a/mojo/public/cpp/bindings/lib/message.cc
+++ b/mojo/public/cpp/bindings/lib/message.cc
@@ -9,6 +9,8 @@
 
 #include <algorithm>
 
+#include "mojo/public/cpp/bindings/lib/message_header_validator.h"
+
 namespace mojo {
 
 Message::Message()
@@ -73,9 +75,8 @@ MojoResult ReadAndDispatchMessage(MessagePipeHandle handle,
                       &num_handles,
                       MOJO_READ_MESSAGE_FLAG_NONE);
   if (receiver && rv == MOJO_RESULT_OK) {
-    bool result = receiver->Accept(&message);
-    if (receiver_result)
-      *receiver_result = result;
+    *receiver_result =
+        internal::MessageHeaderValidator(receiver).Accept(&message);
   }
 
   return rv;