Fix some warnings.

lib/dom/templates/html/impl/impl_SVGElement.darttemplate

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class _AttributeClassSet extends _CssClassSet {
   _AttributeClassSet(element) : super(element);
 
   String $dom_className() => _element.attributes['class'];
 
   void _write(Set s) {
@@ skipping 12 matching lines @@
   ElementList get elements() => new FilteredElementList(this);
 
   void set elements(Collection<Element> value) {
     final elements = this.elements;
     elements.clear();
     elements.addAll(value);
   }
 
   String get outerHTML() {
     final container = new Element.tag("div");
-    final SVGElement clone = this.clone(true);
-    container.elements.add(clone);
+    final SVGElement cloned = this.clone(true);
+    container.elements.add(cloned);
     return container.innerHTML;
   }
 
   String get innerHTML() {
     final container = new Element.tag("div");
-    final SVGElement clone = this.clone(true);
-    container.elements.addAll(clone.elements);
+    final SVGElement cloned = this.clone(true);
+    container.elements.addAll(cloned.elements);
     return container.innerHTML;
   }
 
   void set innerHTML(String svg) {
     final container = new Element.tag("div");
     // Wrap the SVG string in <svg> so that SVGElements are created, rather than
     // HTMLElements.
     container.innerHTML = '<svg version="1.1">$svg</svg>';
     this.elements = container.elements.first.elements;
   }
 
 $!MEMBERS
 }