Backed out changeset 6b0e836a33a9 (bug 1316265) for leaks in Linux x64 devtools tests. r=backout

devtools/server/actors/object.js

@@ -1127,10 +1127,6 @@ DebuggerServer.ObjectActorPreviewers = {
       grip.parameterNames = obj.parameterNames;
     }
 
-    let type = DevToolsUtils.getProperty(obj, "constructor").name;
-    grip.isAsync = type === "AsyncFunction";
-    grip.isGenerator = type === "GeneratorFunction";
-
     // Check if the developer has added a de-facto standard displayName
     // property for us to use.
     let userDisplayName;