Update paper-radio-button to 0.5.4.

third_party/polymer/components/paper-radio-button/paper-radio-button.html

Index: third_party/polymer/components/paper-radio-button/paper-radio-button.html
diff --git a/third_party/polymer/components/paper-radio-button/paper-radio-button.html b/third_party/polymer/components/paper-radio-button/paper-radio-button.html
index d9457bb4f726ee23bf4900a5871c68b21920a240..59478de613db158e89d938bdb6542c2429769f5b 100644
--- a/third_party/polymer/components/paper-radio-button/paper-radio-button.html
+++ b/third_party/polymer/components/paper-radio-button/paper-radio-button.html
@@ -32,7 +32,11 @@ To change the radio checked color:
     paper-radio-button::shadow #onRadio {
       background-color: #4285f4;
     }
-    
+
+    paper-radio-button[checked]::shadow #offRadio {
+      border-color: #4285f4;
+    }
+
 To change the ink color for unchecked state:
 
     paper-radio-button::shadow #ink {
@@ -148,8 +152,7 @@ To change the radio unchecked color:
     },
     
     checkedChanged: function() {
-      this.$.onRadio.classList.toggle('fill', this.checked);
-      this.setAttribute('aria-checked', this.checked ? 'true': 'false');
+      this.setAttribute('aria-checked', this.checked ? 'true' : 'false');
       this.fire('core-change');
     },