Bug 1440284 - change this.EXPORTED_SYMBOLS back to var EXPORTED_SYMBOLS in JS modules, r=mccr8.

toolkit/components/extensions/ExtensionStorage.jsm

@@ -5,7 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 "use strict";
 
-this.EXPORTED_SYMBOLS = ["ExtensionStorage"];
+var EXPORTED_SYMBOLS = ["ExtensionStorage"];
 
 ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
 ChromeUtils.import("resource://gre/modules/Services.jsm");
@@ -81,7 +81,7 @@ function serialize(value) {
   return value;
 }
 
-this.ExtensionStorage = {
+var ExtensionStorage = {
   // Map<extension-id, Promise<JSONFile>>
   jsonFilePromises: new Map(),