Removing dart:html APIs which were deprecated in M2.

sdk/lib/svg/dartium/svg_dartium.dart

Index: sdk/lib/svg/dartium/svg_dartium.dart
diff --git a/sdk/lib/svg/dartium/svg_dartium.dart b/sdk/lib/svg/dartium/svg_dartium.dart
index 3b237350003f8e28295f77674f4b9c92583ca2d3..55f6408442a1f5319fb72f483e9f9bd1d376be69 100644
--- a/sdk/lib/svg/dartium/svg_dartium.dart
+++ b/sdk/lib/svg/dartium/svg_dartium.dart
@@ -7269,16 +7269,6 @@ class SvgElement extends Element {
     return _cssClassSet;
   }
 
-  @deprecated
-  List<Element> get elements => new FilteredElementList(this);
-
-  @deprecated
-  void set elements(Collection<Element> value) {
-    final elements = this.elements;
-    elements.clear();
-    elements.addAll(value);
-  }
-
   List<Element> get children => new FilteredElementList(this);
 
   void set children(List<Element> value) {