[MD settings] controlled by extension icon on default font size

chrome/browser/resources/settings/controls/settings_dropdown_menu.js

Index: chrome/browser/resources/settings/controls/settings_dropdown_menu.js
diff --git a/chrome/browser/resources/settings/controls/settings_dropdown_menu.js b/chrome/browser/resources/settings/controls/settings_dropdown_menu.js
index aaf0834b585c9eeac1cb780d0356dfcd4243673a..74870c56648cce502633b532ec306cf6bc50d6ed 100644
--- a/chrome/browser/resources/settings/controls/settings_dropdown_menu.js
+++ b/chrome/browser/resources/settings/controls/settings_dropdown_menu.js
@@ -29,6 +29,8 @@ var DropdownMenuOptionList;
 Polymer({
   is: 'settings-dropdown-menu',
 
+  behaviors: [CrPolicyPrefBehavior, PrefControlBehavior],
+
   properties: {
     /**
      * List of options for the drop-down menu.
@@ -57,10 +59,6 @@ Polymer({
     },
   },
 
-  behaviors: [
-    PrefControlBehavior,
-  ],
-
   observers: [
     'updateSelected_(menuOptions, pref.value)',
   ],
@@ -125,7 +123,7 @@ Polymer({
    * @private
    */
   shouldDisableMenu_: function() {
-    return this.disabled || this.menuOptions === null ||
-        this.menuOptions.length == 0;
+    return this.disabled || this.isPrefEnforced() ||
+        this.menuOptions === null || this.menuOptions.length == 0;
   },
 });