Remove obsolete stack trace string in a message object.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index aead7be0cc934efc7af442b242b6fc72a126b7de..63bb44166d694d0dae0b219760b2617a2215434a 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1572,7 +1572,6 @@ Handle<JSMessageObject> Factory::NewJSMessageObject(
     int start_position,
     int end_position,
     Handle<Object> script,
-    Handle<Object> stack_trace,
     Handle<Object> stack_frames) {
   CALL_HEAP_FUNCTION(isolate(),
                      isolate()->heap()->AllocateJSMessageObject(*type,
@@ -1580,7 +1579,6 @@ Handle<JSMessageObject> Factory::NewJSMessageObject(
                          start_position,
                          end_position,
                          *script,
-                         *stack_trace,
                          *stack_frames),
                      JSMessageObject);
 }