[strong] fix strong object exception messages

test/message/strong-object-set-proto.out

Index: test/message/strong-object-set-proto.out
diff --git a/test/message/strong-object-set-proto.out b/test/message/strong-object-set-proto.out
new file mode 100644
index 0000000000000000000000000000000000000000..bf2c9334f701bc0bdf503adcf341093312a807d0
--- /dev/null
+++ b/test/message/strong-object-set-proto.out
@@ -0,0 +1,9 @@
+# Copyright 2015 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+*%(basename)s:9: TypeError: On strong object #<Object>, redefining the internal prototype is deprecated
+({}).__proto__ = {};
+               ^
+TypeError: On strong object #<Object>, redefining the internal prototype is deprecated
+    at Object.set __proto__ (native)
+    at *%(basename)s:9:16