Remove stale files from lib/html/src.

lib/html/src/SVGElementWrappingImplementation.dart

-// Copyright (c) 2012, 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 _SVGClassSet extends _CssClassSet {
-  _SVGClassSet(element) : super(element);
-
-  String _className() => _element.className.baseVal;
-
-  void _write(Set s) {
-    _element.className.baseVal = _formatSet(s);
-  }
-}
-
-class SVGElementWrappingImplementation extends ElementWrappingImplementation implements SVGElement {
-  SVGElementWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
-
-  factory SVGElementWrappingImplementation.tag(String tag) =>
-    LevelDom.wrapSVGElement(dom.document.createElementNS(
-        "http://www.w3.org/2000/svg", tag));
-
-  factory SVGElementWrappingImplementation.svg(String svg) {
-    Element parentTag;
-    final match = _START_TAG_REGEXP.firstMatch(svg);
-    if (match != null && match.group(1).toLowerCase() == 'svg') {
-      parentTag = new Element.tag('div');
-    } else {
-      parentTag = new SVGSVGElement();
-    }
-
-    parentTag.innerHTML = svg;
-    if (parentTag.elements.length == 1) return parentTag.nodes.removeLast();
-
-    throw new IllegalArgumentException(
-        'SVG had ${parentTag.elements.length} '
-        'top-level elements but 1 expected');
-  }
-
-  CSSClassSet get classes() {
-    if (_cssClassSet === null) {
-      _cssClassSet = new _SVGClassSet(_ptr);
-    }
-    return _cssClassSet;
-  }
-
-  String get id() { return _ptr.id; }
-
-  void set id(String value) { _ptr.id = value; }
-
-  SVGSVGElement get ownerSVGElement() { return LevelDom.wrapSVGSVGElement(_ptr.ownerSVGElement); }
-
-  SVGElement get viewportElement() { return LevelDom.wrapSVGElement(_ptr.viewportElement); }
-
-  String get xmlbase() { return _ptr.xmlbase; }
-
-  void set xmlbase(String value) { _ptr.xmlbase = value; }
-
-  ElementList get elements() {
-    if (_elements == null) {
-      _elements = new FilteredElementList(this);
-    }
-    return _elements;
-  }
-
-  void set elements(Collection<Element> value) {
-    final elements = this.elements;
-    elements.clear();
-    elements.addAll(value);
-  }
-
-  String get outerHTML() {
-    final container = new Element.tag("div");
-    container.elements.add(this.clone(true));
-    return container.innerHTML;
-  }
-
-  String get innerHTML() {
-    final container = new Element.tag("div");
-    container.elements.addAll(this.clone(true).elements);
-    return container.innerHTML;
-  }
-
-  void set innerHTML(String svg) {
-    var container = new Element.tag("div");
-    // Wrap the SVG string in <svg> so that SVGElements are created, rather than
-    // HTMLElements.
-    container.innerHTML = '<svg version="1.1">$svg</svg>';
-    this.elements = container.elements.first.elements;
-  }
-
-  SVGElement clone(bool deep) => super.clone(deep);
-}