Fix strong mode errors in SVG

sdk/lib/svg/dart2js/svg_dart2js.dart

 /**
  * Scalable Vector Graphics:
  * Two-dimensional vector graphics with support for events and animation.
  *
  * For details about the features and syntax of SVG, a W3C standard,
  * refer to the
  * [Scalable Vector Graphics Specification](http://www.w3.org/TR/SVG/).
  */
 library dart.dom.svg;
 
@@ skipping 4628 matching lines @@
 
   @DomName('SVGStyleElement.media')
   @DocsEditable()
   String media;
 
   @DomName('SVGStyleElement.sheet')
   @DocsEditable()
   @Experimental() // untriaged
   final StyleSheet sheet;
 
-  // Shadowing definition.
-  String get title => JS("String", "#.title", this);
-
-  set title(String value) {
-    JS("void", "#.title = #", this, value);
-  }
+  // Use implementation from Element.
+  // final String title;
 
   @DomName('SVGStyleElement.type')
   @DocsEditable()
   String type;
 }
 // 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.
 
 
@@ skipping 413 matching lines @@
   AnimatedString get _svgClassName => JS("AnimatedString", "#.className", this);
 
   @JSName('ownerSVGElement')
   @DomName('SVGElement.ownerSVGElement')
   @DocsEditable()
   final SvgSvgElement ownerSvgElement;
 
   // Use implementation from Element.
   // final CssStyleDeclaration style;
 
-  // Shadowing definition.
-  int get tabIndex => JS("int", "#.tabIndex", this);
-
-  set tabIndex(int value) {
-    JS("void", "#.tabIndex = #", this, value);
-  }
+  // Use implementation from Element.
+  // final int tabIndex;
 
   @DomName('SVGElement.viewportElement')
   @DocsEditable()
   final SvgElement viewportElement;
 
   @DomName('SVGElement.blur')
   @DocsEditable()
   @Experimental() // untriaged
   void blur() native;
 
@@ skipping 1354 matching lines @@
    * Constructor instantiated by the DOM when a custom element has been created.
    *
    * This can only be called by subclasses from their created constructor.
    */
   _SVGMPathElement.created() : super.created();
 
   // From SVGURIReference
 
 }