Issue 2010 - Remove some uses of "for each" with "for of"

chrome/content/ui/composer.js

Index: chrome/content/ui/composer.js
===================================================================
--- a/chrome/content/ui/composer.js
+++ b/chrome/content/ui/composer.js
@@ -141,17 +141,17 @@ function init()
     E("domainRestriction").value = docDomain;
 
   E("thirdParty").hidden = !thirdParty;
   E("firstParty").hidden = thirdParty;
 
   let typeGroup = E("typeGroup");
   let defaultTypes = RegExpFilter.prototype.contentType & ~RegExpFilter.typeMap.DOCUMENT;
   let isDefaultType = (RegExpFilter.typeMap[item.typeDescr] & defaultTypes) != 0;
-  for each (let type in types)
+  for (let type of types)
   {
     if (type == Policy.type.ELEMHIDE)
       continue;
 
     let typeNode = document.createElement("checkbox");
     typeNode.setAttribute("value", Policy.typeDescr[type].toLowerCase().replace(/\_/g, "-"));
     typeNode.setAttribute("label", Policy.localizedDescr[type].toLowerCase());