Remove methods of TextIterator that take Range objects

Source/web/mac/WebSubstringUtil.mm

 /*
  * Copyright (C) 2005, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 48 matching lines @@
 
 using namespace blink;
 
 static NSAttributedString* attributedSubstringFromRange(const Range* range)
 {
     NSMutableAttributedString* string = [[NSMutableAttributedString alloc] init];
     NSMutableDictionary* attrs = [NSMutableDictionary dictionary];
     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;
 
         Node* container = it.startContainer();
         LayoutObject* renderer = container->layoutObject();
         ASSERT(renderer);
         if (!renderer)
             continue;
 
@@ skipping 79 matching lines @@
     if (!editable)
         return nil;
     RefPtrWillBeRawPtr<Range> range(PlainTextRange(location, location + length).createRange(*editable));
     if (!range)
         return nil;
 
     return attributedSubstringFromRange(range.get());
 }
 
 } // namespace blink