Revert "Add @deprecated and @override to core."

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index e4c5451e15cf43652749e92e0e400dbfca03a9c4..cb201d77fed8c8fff2600adfeef5f403785d0436 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -8788,14 +8788,11 @@ abstract class Element extends Node implements ElementTraversal {
   /**
    * Deprecated, use innerHtml instead.
    */
-  @deprecated
   String get innerHTML => this.innerHtml;
-  @deprecated
   void set innerHTML(String value) {
     this.innerHtml = value;
   }
 
-  @deprecated
   void set elements(Collection<Element> value) {
     this.children = value;
   }
@@ -8803,7 +8800,6 @@ abstract class Element extends Node implements ElementTraversal {
   /**
    * Deprecated, use [children] instead.
    */
-  @deprecated
   List<Element> get elements => this.children;
 
   /**