Update paper-radio-button to 0.5.4.

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

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 `paper-radio-button` is a button that can be either checked or unchecked.
 User can tap the radio button to check it.  But it cannot be unchecked by
@@ skipping 12 matching lines @@
 
     paper-radio-button::shadow #ink[checked] {
       color: #4285f4;
     }
     
 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 {
       color: #b5b5b5;
     }
     
 To change the radio unchecked color:
     
     paper-radio-button::shadow #offRadio {
       border-color: #b5b5b5;
@@ skipping 20 matching lines @@
     <paper-ripple id="ink" class="circle recenteringTouch" checked?="{{!checked}}"></paper-ripple>
     
   </div>
   
   <div id="radioLabel" aria-hidden="true" hidden?="{{!label}}">{{label}}<content></content></div>
   
 </template>
 
 </polymer-element>
 <script charset="utf-8" src="paper-radio-button-extracted.js"></script></body></html>