Bug 1219837 - Part 3: Remove use of expression closure from devtools/. r=jryans

--HG--
extra : commitid : DcepCnPCAx3
extra : rebase_source : 74750fbedbb2e9355a81b0512e584f5a262117c6
extra : amend_source : bfb6559eaefb5d12478b8ae7f849aef049488c81

devtools/client/jsonview/converter-child.js

@@ -52,7 +52,9 @@ var Converter = Class({
     "nsIRequestObserver"
   ],
 
-  get wrappedJSObject() this,
+  get wrappedJSObject() {
+    return this;
+  },
 
   /**
    * This component works as such:

devtools/client/jsonview/converter-sniffer.js

@@ -39,7 +39,9 @@ var Sniffer = Class({
     "nsIContentSniffer",
   ],
 
-  get wrappedJSObject() this,
+  get wrappedJSObject() {
+    return this;
+  },
 
   getMIMETypeFromContent: function(aRequest, aData, aLength) {
     // JSON View is enabled only for top level loads only.