Bug 1221113 - Put insecure-login-form doorhanger behind a flag. r=margaret

--HG--
extra : commitid : 7CMdM89A2ay
extra : rebase_source : e582f2d4c60bf1e672f153700825583baaf070c1

mobile/android/chrome/content/browser.js

@@ -4764,7 +4764,9 @@ var BrowserEventHandler = {
 
     InitLater(() => BrowserApp.deck.addEventListener("click", InputWidgetHelper, true));
     InitLater(() => BrowserApp.deck.addEventListener("click", SelectHelper, true));
-    InitLater(() => BrowserApp.deck.addEventListener("InsecureLoginFormsStateChange", IdentityHandler.sendLoginInsecure, true));
+    if (AppConstants.NIGHTLY_BUILD) {
+      InitLater(() => BrowserApp.deck.addEventListener("InsecureLoginFormsStateChange", IdentityHandler.sendLoginInsecure, true));
+    }
 
     // ReaderViews support backPress listeners.
     Messaging.addListener(() => {