Update interfaces/html.idl

Note: This file was recently manually updated in commit 4c70b5a.
      This commit may revert some of those changes.

Source: https://github.com/tidoust/reffy-reports/blob/66323ce/whatwg/idl/html.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/498574778

interfaces/html.idl

@@ -114,8 +114,6 @@ interface HTMLElement : Element {
   [CEReactions] attribute DOMString autocapitalize;
 
   [CEReactions] attribute [TreatNullAs=EmptyString] DOMString innerText;
-
-  ElementInternals attachInternals();
 };
 
 HTMLElement includes GlobalEventHandlers;
@@ -178,6 +176,8 @@ interface HTMLLinkElement : HTMLElement {
   [CEReactions] attribute DOMString hreflang;
   [CEReactions] attribute DOMString type;
   [SameObject, PutForwards=value] readonly attribute DOMTokenList sizes;
+  [CEReactions] attribute USVString imageSrcset;
+  [CEReactions] attribute DOMString imageSizes;
   [CEReactions] attribute DOMString referrerPolicy;
 };
 HTMLLinkElement includes LinkStyle;
@@ -1412,11 +1412,6 @@ dictionary ElementDefinitionOptions {
   DOMString extends;
 };
 
-[Exposed=Window]
-interface ElementInternals {
-
-};
-
 dictionary FocusOptions {
   boolean preventScroll = false;
 };