Node.isSameNode removed in Firefox 10 (GWT 1.4)

For anyone still (*sigh*) dependent on GWT 1.4, the removal of the
isSameNode function in Firefox 10 will likely result in JavaScript
errors in your compiled modules.

https://bugzilla.mozilla.org/show_bug.cgi?id=687400
https://developer.mozilla.org/en/Firefox_10_for_developers
https://developer.mozilla.org/en/DOM/Node.isSameNode

This is a similar situation to the removal of getBoxObjectFor in
Firefox 3.6: http://groups.google.com/group/google-web-toolkit/browse_thread/thread/88a8437754345092/e519ad6f11a081ad

The problem can be fixed by editing DOMImplMozilla.java in gwt-
user.jar and replacing the 4 isSameNode tests with === comparisons.
The comments indicate that isSameNode was used because direct
comparison was unreliable, but presumably this is no longer an issue
in later versions of Firefox. If you need to support a wide range of
Firefox versions, then testing for the existence of the function and
using it if it exists or falling back to direct comparison if it
doesn't is probably the safest approach.

DOMImplMozilla.java is the only file you need to modify. The
corresponding .class file is not used for compilation or in hosted
mode, and gwt-servlet.jar does not include this class.

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