MD Settings: compose a <paper-radio-button> instead of wrapping one in <controlled-radio-button>

chrome/test/data/webui/settings/controlled_radio_button_tests.js

Index: chrome/test/data/webui/settings/controlled_radio_button_tests.js
diff --git a/chrome/test/data/webui/settings/controlled_radio_button_tests.js b/chrome/test/data/webui/settings/controlled_radio_button_tests.js
index b19962e6f7d0db7dd49e9a4b6c2261d9296a0192..12290a758dad302fa5b69eee0844d16b6758f71b 100644
--- a/chrome/test/data/webui/settings/controlled_radio_button_tests.js
+++ b/chrome/test/data/webui/settings/controlled_radio_button_tests.js
@@ -24,7 +24,8 @@ suite('controlled radio button', function() {
     radioButton.set('pref.enforcement',
                     chrome.settingsPrivate.Enforcement.ENFORCED);
     Polymer.dom.flush();
-    assertTrue(radioButton.$$('paper-radio-button').disabled);
+    // TODO(dbeam): rewrite this not to test private state (controlled_).
+    assertTrue(radioButton.controlled_);
     assertFalse(!!radioButton.$$('cr-policy-pref-indicator'));
 
     radioButton.set('name', 'true');
@@ -33,7 +34,7 @@ suite('controlled radio button', function() {
 
     radioButton.set('pref.enforcement', undefined);
     Polymer.dom.flush();
-    assertFalse(radioButton.$$('paper-radio-button').disabled);
+    assertFalse(radioButton.controlled_);
     assertEquals('none',
                  radioButton.$$('cr-policy-pref-indicator').style.display);
   });