Remove redundant definition of TameDOMTokenList.length for FF. https://codereview.appspot.com/233750043
Remove redundant definition of TameDOMTokenList.length for FF.
https://codereview.appspot.com/233750043

ArrayLike already provides a "length" property, and TameDOMTokenList
is an ArrayLike, so it shouldn't try to define its own.

This happened to work before, but on current Firefox the property
definition fails in ES5/3 due to trying to do an emulated property
definition on top of a real accessor property.

R=erights@gmail.com

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