Adapt to latest spec changes for Proxy.create[Function].

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index be236a4a34a95bd4ccd31bfcabfb437d87df2b3f..7adb6b10126b2f28617d324ffacae64d19c65ae9 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -185,6 +185,7 @@ function FormatMessage(message) {
       "define_disallowed",            ["Cannot define property:", "%0", ", object is not extensible."],
       "non_extensible_proto",         ["%0", " is not extensible"],
       "handler_non_object",           ["Proxy.", "%0", " called with non-object as handler"],
+      "proto_non_object",             ["Proxy.", "%0", " called with non-object as prototype"],
       "trap_function_expected",       ["Proxy.", "%0", " called with non-function for '", "%1", "' trap"],
       "handler_trap_missing",         ["Proxy handler ", "%0", " has no '", "%1", "' trap"],
       "handler_trap_must_be_callable", ["Proxy handler ", "%0", " has non-callable '", "%1", "' trap"],