undo workarounds for bug 449811 (create fresh lexical binding for each iteration of for-in/of loop)

lib/browser/api/web-contents.js

@@ -95,12 +95,7 @@ let wrapWebContents = function(webContents) {
   }
 
   // Mapping webFrame methods.
-  for (let method2 of webFrameMethods) {
-    // Redeclare variable within block to work around Mozilla bug 449811.
-    // TODO: remove workaround once Mozilla bug is fixed.
-    // https://github.com/mozilla/positron/issues/68
-    let method = method2;
-
+  for (let method of webFrameMethods) {
     webContents[method] = function(...args) {
       this.send('ELECTRON_INTERNAL_RENDERER_WEB_FRAME_METHOD', method, args);
     };

lib/renderer/api/remote.js

@@ -93,12 +93,7 @@ var wrapArgs = function(args, visited) {
 // Populate object's members from descriptors.
 // This matches |getObjectMemebers| in rpc-server.
 let setObjectMembers = function(object, metaId, members) {
-  for (let member2 of members) {
-    // Redeclare variable within block to work around Mozilla bug 449811.
-    // TODO: remove workaround once Mozilla bug is fixed.
-    // https://github.com/mozilla/positron/issues/68
-    let member = member2;
-
+  for (let member of members) {
     if (object.hasOwnProperty(member.name))
       continue;