Cleanup of various DOM dart2js and dart_analyzer warnings

sdk/lib/svg/dart2js/svg_dart2js.dart

 library dart.dom.svg;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev';
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:_js_helper' show Creates, Returns, JavaScriptIndexingBehavior, JSName;
 import 'dart:_foreign_helper' show JS;
 import 'dart:_interceptors' show Interceptor;
@@ skipping 5347 matching lines @@
       _SvgElementFactoryProvider.createSvgElement_svg(svg);
 
   _AttributeClassSet _cssClassSet;
   CssClassSet get classes {
     if (_cssClassSet == null) {
       _cssClassSet = new _AttributeClassSet(this);
     }
     return _cssClassSet;
   }
 
-  List<Element> get children => new FilteredElementList(this);
+  List<Element> get children => new FilteredElementList<Element>(this);
 
   void set children(List<Element> value) {
     final children = this.children;
     children.clear();
     children.addAll(value);
   }
 
   String get outerHtml {
     final container = new Element.tag("div");
     final SvgElement cloned = this.clone(true);
@@ skipping 1575 matching lines @@
 
 
 @DocsEditable
 @DomName('SVGVKernElement')
 abstract class _SVGVKernElement extends SvgElement native "SVGVKernElement" {
 
   @DomName('SVGVKernElement.SVGVKernElement')
   @DocsEditable
   factory _SVGVKernElement() => _SvgElementFactoryProvider.createSvgElement_tag("vkern");
 }