fix settings.js

BUG=485381
NOTRY=true

Review URL: https://codereview.chromium.org/1134553006

Cr-Commit-Position: refs/heads/master@{#329570}

chrome/browser/resources/settings/settings.js

@@ -16,7 +16,7 @@
 Polymer({
   is: 'cr-settings',
 
-  properties {
+  properties: {
     /**
      * The CrSettingsPrefsElement used throughout the app.
      * @private {!CrSettingsPrefsElement}