[cssom-view] Fix WebIDL error: [NewObject] sequence<T> is invalid

Author: zcorpan

cssom-view/Overview.bs

@@ -1028,7 +1028,7 @@ dictionary ScrollIntoViewOptions : ScrollOptions {
 };
 
 partial interface Element {
-  [NewObject] sequence<DOMRect> getClientRects();
+  sequence<DOMRect> getClientRects();
   [NewObject] DOMRect getBoundingClientRect();
   void scrollIntoView();
   void scrollIntoView((boolean or object) arg);
@@ -1410,7 +1410,7 @@ The objects the methods described below return must be static.
 
 <pre class=idl>
 partial interface Range {
-  [NewObject] sequence&lt;DOMRect> getClientRects();
+  sequence&lt;DOMRect> getClientRects();
   [NewObject] DOMRect getBoundingClientRect();
 };
 </pre>