Bug 1523457 - Revert a workaround from bug 1517544. r=jaws

Differential Revision: https://phabricator.services.mozilla.com/D17979

--HG--
extra : moz-landing-system : lando

intl/l10n/DOMLocalization.jsm

@@ -570,6 +570,10 @@ class DOMLocalization extends Localization {
    * @returns {Promise}
    */
   translateRoots() {
+    if (this.resourceIds.length === 0) {
+      return Promise.resolve();
+    }
+
     const roots = Array.from(this.roots);
     return Promise.all(
       roots.map(async root => {

intl/l10n/Localization.jsm

@@ -229,9 +229,7 @@ class Localization {
 
   removeResourceIds(resourceIds) {
     this.resourceIds = this.resourceIds.filter(r => !resourceIds.includes(r));
-    if (this.resourceIds.length) {
-      this.onChange();
-    }
+    this.onChange();
     return this.resourceIds.length;
   }