Remove methods of TextIterator that take Range objects

Source/web/mac/WebSubstringUtil.mm

Index: Source/web/mac/WebSubstringUtil.mm
diff --git a/Source/web/mac/WebSubstringUtil.mm b/Source/web/mac/WebSubstringUtil.mm
index a70bacadc60cad41ab2d79ecfb65ef1e82b8a4fc..152a08d8cacc3e8fe45f487fd0b6ed5b773f71ce 100644
--- a/Source/web/mac/WebSubstringUtil.mm
+++ b/Source/web/mac/WebSubstringUtil.mm
@@ -66,7 +66,7 @@ static NSAttributedString* attributedSubstringFromRange(const Range* range)
     size_t length = range->endOffset() - range->startOffset();
 
     unsigned position = 0;
-    for (TextIterator it(range); !it.atEnd() && [string length] < length; it.advance()) {
+    for (TextIterator it(range->startPosition(), range->endPosition()); !it.atEnd() && [string length] < length; it.advance()) {
         unsigned numCharacters = it.length();
         if (!numCharacters)
             continue;