Fix strong mode errors in SVG

sdk/lib/svg/dart2js/svg_dart2js.dart

Index: sdk/lib/svg/dart2js/svg_dart2js.dart
diff --git a/sdk/lib/svg/dart2js/svg_dart2js.dart b/sdk/lib/svg/dart2js/svg_dart2js.dart
index 4b967b906e9fcac6b6c6c3398bfe718bf1ee3007..e15ec4f7d7458598035b46612adcd4dd80fdf01a 100644
--- a/sdk/lib/svg/dart2js/svg_dart2js.dart
+++ b/sdk/lib/svg/dart2js/svg_dart2js.dart
@@ -4646,12 +4646,8 @@ class StyleElement extends SvgElement {
   @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()
@@ -5085,12 +5081,8 @@ class SvgElement extends Element implements GlobalEventHandlers {
   // 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()