Mixed content fix

service-worker/selective-caching/index.html

@@ -49,7 +49,7 @@ limitations under the License.
 
     <link rel="stylesheet" href="../../styles/main.css">
 
-    <link rel='stylesheet' type='text/css' href='http://fonts.googleapis.com/css?family=Special+Elite'>
+    <link rel='stylesheet' type='text/css' href='https://fonts.googleapis.com/css?family=Special+Elite'>
     <style>
       .output {
         font-family: 'Special Elite';