Chrome roll 181864->184590.

tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate

Index: tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate b/tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate
index f2777b6f3ac702e97fa69b03e42f56327a17558e..c64f11a30730523044b3d42b4c424b3a8aa0ceef 100644
--- a/tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate
+++ b/tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate
@@ -16,17 +16,6 @@ $!MEMBERS
     document.$dom_body = value;
   }
 
-  /**
-   * Registers a custom Element subclass as an available HTML tag.
-   *
-   * Not yet implemented.
-   */
-  @Experimental
-  void register(String tagName, Type elementClass) {
-    // TODO: tagName validation
-    throw new Exception('Not yet implemented');
-  }
-
   @DomName('Document.caretRangeFromPoint')
   Range caretRangeFromPoint(int x, int y) {
     return document.$dom_caretRangeFromPoint(x, y);