Removing dart:html APIs which were deprecated in M2.

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 4e05772a70d3d1548021e3604de9df55aef9220f..262e34499f3647b3c1c4a30378f5284aa2b2664c 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -7620,15 +7620,6 @@ class DocumentFragment extends Node {
   factory DocumentFragment.svg(String svgContent) =>
       _DocumentFragmentFactoryProvider.createDocumentFragment_svg(svgContent);
 
-  @deprecated
-  List<Element> get elements => this.children;
-
-  // TODO: The type of value should be Collection<Element>. See http://b/5392897
-  @deprecated
-  void set elements(value) {
-    this.children = value;
-  }
-
   List<Element> _children;
 
   List<Element> get children {
@@ -9308,27 +9299,6 @@ 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;
-  }
-
-  /**
-   * Deprecated, use [children] instead.
-   */
-  @deprecated
-  List<Element> get elements => this.children;
-
-  /**
    * List of the direct children of this element.
    *
    * This collection can be used to add and remove elements from the document.