Make Range.detach() a no-op

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 52 matching lines @@
     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()) {
         unsigned numCharacters = it.length();
         if (!numCharacters)
             continue;
 
-        Node* container = it.range()->startContainer(IGNORE_EXCEPTION);
+        Node* container = it.range()->startContainer();
         RenderObject* renderer = container->renderer();
         ASSERT(renderer);
         if (!renderer)
             continue;
 
         RenderStyle* style = renderer->style();
         NSFont* font = style->font().primaryFont()->getNSFont();
         // If the platform font can't be loaded, it's likely that the site is
         // using a web font. For now, just use the default font instead.
         // TODO(rsesek): Change the font activation flags to allow other processes
@@ skipping 72 matching lines @@
     Element* editable = frame->selection().rootEditableElementOrDocumentElement();
     ASSERT(editable);
     RefPtrWillBeRawPtr<Range> range(PlainTextRange(location, location + length).createRange(*editable));
     if (!range)
         return nil;
 
     return attributedSubstringFromRange(range.get());
 }
 
 } // namespace blink