[heycam/webidl] Class string of default iterator object seems to have been accidentally changed? (#419)

Commit d433e0a6ae4f81b35364e0890694a8b094a5f669 (#198) has a commit message of the following:

```git
commit d433e0a6ae4f81b35364e0890694a8b094a5f669
Author:     Tobie Langel <tobie@codespeaks.com>
AuthorDate: Wed Oct 26 09:13:35 2016 +0200
Commit:     GitHub <noreply@github.com>
CommitDate: Wed Oct 26 09:13:35 2016 +0200

    Use Bikeshed’s algorithm construct. (#198)
    
    * Marks up all algorithms with <div algorithm>.
    * Gives a name to algorithms which don't include a <dfn>.
    * Fix algorithms that generate Bikeshed warnings, notably by:
        * Replacing prose calls to [[Call]] method by Call(args).
        * Fixing incorrectly named variables.
        * Adding |T|, |U|, |A|, |map|, |object|, |I| and |id| to Ignored Vars.
```

However, it contains the following normative change (white space differences ignored):

```diff
 When a [=default iterator object=] is first created,
 its index is set to 0.
 
 The [=class string=] of a [=default iterator object=] for a given [=interface=]
 is the result of concatenting the [=identifier=] of the [=interface=]
-and the string “ Iterator”.
+and the string “Iterator”.
 
 
 <h5 id="es-iterator-prototype-object">Iterator prototype object</h5>
```

It seems to have been accidental, but there are already some implementations using the new changed spec (admittedly, most of which were written by me).

/cc @tobie 

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