Incorrect error message for missing symbol methods

[bterlson]

For example:

var obj = Object.create(null);
obj[Symbol.iterator]();

Actual: TypeError: Object doesn't support property or method 'ToString'
Expected: Object doesn't support property or method 'Symbol.iterator'

Or we could go with an error message similar to v8 and sm:

obj[Symbol.iterator] is not a function

[dilijev]

Assigning to @tcare who has been working on Symbol.toStringTag which is where I assume that error message is coming from