Fix for issue 1814 for dart:dom

Fix for issue 1814 for dart:dom

Emit canned native bodies as a work-around for Issue 1814.

A better solution is to support the alternate name directly - then the
compiler can specialize the call site and avoid testing argument
values to determine the number of parameters.

BUG=
TEST=

Committed: https://code.google.com/p/dart/source/detail?r=4557

[vsm, 2012-02-23 23:26:58]

LGTM