Avoid allocating temporary ranges in connection with text and character iterators.

Source/core/dom/DocumentMarkerController.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 136 matching lines @@
     clear();
 }
 
 void DocumentMarkerController::removeMarkers(Range* range, DocumentMarker::MarkerTypes markerTypes, RemovePartiallyOverlappingMarkerOrNot shouldRemovePartiallyOverlappingMarker)
 {
     for (TextIterator markedText(range); !markedText.atEnd(); markedText.advance()) {
         if (!possiblyHasMarkers(markerTypes))
             return;
         ASSERT(!m_markers.isEmpty());
 
-        RefPtrWillBeRawPtr<Range> textPiece = markedText.range();
-        int startOffset = textPiece->startOffset();
-        int endOffset = textPiece->endOffset();
-        removeMarkers(textPiece->startContainer(), startOffset, endOffset - startOffset, markerTypes, shouldRemovePartiallyOverlappingMarker);
+        int startOffset = markedText.startOffset();
+        int endOffset = markedText.endOffset();
+        removeMarkers(markedText.startContainer(), startOffset, endOffset - startOffset, markerTypes, shouldRemovePartiallyOverlappingMarker);
     }
 }
 
 static bool startsFurther(const OwnPtrWillBeMember<RenderedDocumentMarker>& lhv, const DocumentMarker* rhv)
 {
     return lhv->startOffset() < rhv->startOffset();
 }
 
 static bool startsAfter(const OwnPtrWillBeMember<RenderedDocumentMarker>& marker, size_t startOffset)
 {
@@ skipping 592 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 void showDocumentMarkers(const blink::DocumentMarkerController* controller)
 {
     if (controller)
         controller->showMarkers();
 }
 #endif