Update interfaces/resize-observer.idl (#26319)

Source: https://github.com/w3c/webref/blob/dedc614/ed/idl/resize-observer.idl
Build: https://travis-ci.org/w3c/webref/builds/194880389
diff --git a/interfaces/resize-observer.idl b/interfaces/resize-observer.idl
index 0d2aa28..d4973b7 100644
--- a/interfaces/resize-observer.idl
+++ b/interfaces/resize-observer.idl
@@ -35,10 +35,3 @@
     readonly attribute unrestricted double inlineSize;
     readonly attribute unrestricted double blockSize;
 };
-
-interface ResizeObservation {
-    constructor(Element target);
-    readonly attribute Element target;
-    readonly attribute ResizeObserverBoxOptions observedBox;
-    readonly attribute FrozenArray<ResizeObserverSize> lastReportedSizes;
-};