bug 882652 fix disabling of socialapi in popups, r=felipe

browser/base/content/browser-social.js

@@ -324,7 +324,10 @@ SocialUI = {
   get _chromeless() {
     // Is this a popup window that doesn't want chrome shown?
     let docElem = document.documentElement;
-    let chromeless = docElem.getAttribute("chromehidden").indexOf("extrachrome") >= 0;
+    // extrachrome is not restored during session restore, so we need
+    // to check for the toolbar as well.
+    let chromeless = docElem.getAttribute("chromehidden").contains("extrachrome") ||
+                     docElem.getAttribute('chromehidden').contains("toolbar");
     // This property is "fixed" for a window, so avoid doing the check above
     // multiple times...
     delete this._chromeless;