Fix build after revert at 28332.

tools/js2c.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 413 matching lines @@
   source_files = sorted(source_files,
                         lambda l,r: IsDebuggerFile(r) - IsDebuggerFile(l))
 
   source_files_and_contents = [(f, ReadFile(f)) for f in source_files]
 
   # Have a single not-quite-empty source file if there are none present;
   # otherwise you get errors trying to compile an empty C++ array.
   # It cannot be empty (or whitespace, which gets trimmed to empty), as
   # the deserialization code assumes each file is nonempty.
   if not source_files_and_contents:
-    source_files_and_contents = [("dummy.js", "void 0;")]
+    source_files_and_contents = [("dummy.js", "(function() {})")]
 
   result = Sources()
 
   for (source, contents) in source_files_and_contents:
     try:
       lines = filters(contents)
     except Error as e:
       raise Error("In file %s:\n%s" % (source, str(e)))
 
     result.modules.append(lines)
@@ skipping 147 matching lines @@
   parser.add_argument("--js",
                       help="writes a JS file output instead of a C file",
                       action="store_true")
 
   args = vars(parser.parse_args())
   JS2C(args["sources.js"], args["out.cc"], args["type"], args["raw"], args["startup_blob"], args["js"])
 
 
 if __name__ == "__main__":
   main()