[MD settings] show icon when slider controlled by something

chrome/test/data/webui/cr_elements/cr_elements_browsertest.js

Index: chrome/test/data/webui/cr_elements/cr_elements_browsertest.js
diff --git a/chrome/test/data/webui/cr_elements/cr_elements_browsertest.js b/chrome/test/data/webui/cr_elements/cr_elements_browsertest.js
index 8485a0d41348ed2a42b4023f608a6f89164a627d..ee811d084c0b280eb04e8a6aa7f3fc567ef15358 100644
--- a/chrome/test/data/webui/cr_elements/cr_elements_browsertest.js
+++ b/chrome/test/data/webui/cr_elements/cr_elements_browsertest.js
@@ -127,6 +127,7 @@ CrElementsSliderTest.prototype = {
 
   /** @override */
   extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
+    'settings_private_test_constants.js',
     'cr_slider_tests.js',
   ]),
 };
@@ -218,6 +219,7 @@ CrElementsPolicyPrefIndicatorTest.prototype = {
 
   /** @override */
   extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
+    'settings_private_test_constants.js',
     'cr_policy_strings.js',
     'cr_policy_pref_indicator_tests.js',
   ]),