Bug 1315885 - Part 1: Add ShadowRoot CEReactions annotation. r=smaug

--HG--
extra : rebase_source : ecb09ce6a23b5b778f5b4fe1f8c04b74793b86aa

dom/webidl/ShadowRoot.webidl

@@ -17,7 +17,7 @@ interface ShadowRoot : DocumentFragment
   HTMLCollection getElementsByTagName(DOMString localName);
   HTMLCollection getElementsByTagNameNS(DOMString? namespace, DOMString localName);
   HTMLCollection getElementsByClassName(DOMString classNames);
-  [SetterThrows,TreatNullAs=EmptyString]
+  [CEReactions, SetterThrows, TreatNullAs=EmptyString]
   attribute DOMString innerHTML;
   readonly attribute Element host;
   readonly attribute ShadowRoot? olderShadowRoot;