Remove extraneous fields from SegmentIterator

Fixes tc39#54

README.md

@@ -62,14 +62,6 @@ Move the iterator to the next break position after the given code unit index _in
 
 Move the iterator to the previous break position before the given code unit index _index_, or if no index is provided, before its current index. Returns *true* if the beginning of the string was reached.
 
-#### `get %SegmentIterator%.prototype.index`
-
-Return the code unit index of the most recently discovered break position, as an offset from the beginning of the string. Initially the `index` is 0.
-
-#### `get %SegmentIterator%.prototype.breakType`
-
-The `breakType` of the most recently discovered segment. If there is no current segment (e.g., a just-instantiated SegmentIterator, or one which has reached the end), or if the break type is "grapheme", then this will be `undefined`.
-
 ## FAQ
 
 Q: Why should we pass a locale and options bag for grapheme breaks? Isn't there just one way to do it?

spec.html

@@ -366,24 +366,6 @@ <h1>%SegmentIteratorPrototype%.preceding( [ _from_ ] )</h1>
           1. return AdvanceSegmentIterator(_iterator_, ~backwards~).
         </emu-alg>
       </emu-clause>
-
-      <emu-clause id="sec-segment-iterator-prototype-index">
-        <h1>get %SegmentIteratorPrototype%.index</h1>
-        <emu-alg>
-          1. Let _iterator_ be *this* value.
-          1. If _iterator_ does not have a [[SegmentIteratorSegmenter]] internal slot, throw a *TypeError* exception.
-          1. Return _iterator_.[[SegmentIteratorIndex]].
-        </emu-alg>
-      </emu-clause>
-
-      <emu-clause id="sec-segment-iterator-prototype-breakType">
-        <h1>get %SegmentIteratorPrototype%.breakType</h1>
-        <emu-alg>
-          1. Let _iterator_ be *this* value.
-          1. If _iterator_ does not have a [[SegmentIteratorSegmenter]] internal slot, throw a *TypeError* exception.
-          1. Return _iterator_.[[SegmentIteratorBreakType]].
-        </emu-alg>
-      </emu-clause>
     </emu-clause>
   </emu-clause>
 </emu-clause>