--- a/testing/web-platform/tests/encrypted-media/scripts/unique-origin.js
+++ b/testing/web-platform/tests/encrypted-media/scripts/unique-origin.js
@@ -5,32 +5,32 @@ function runTest(config) {
 
     function load_iframe(src, sandbox) {
         return new Promise(function (resolve) {
             var iframe = document.createElement('iframe');
             iframe.onload = function () {
                 resolve(iframe);
             };
             iframe.sandbox = sandbox;
-            iframe.src = src;
+            iframe.srcdoc = src;
             document.documentElement.appendChild(iframe);
         });
     }
 
     function wait_for_message() {
         return new Promise(function (resolve) {
             self.addEventListener('message', function listener(e) {
                 resolve(e.data);
                 self.removeEventListener('message', listener);
             });
         });
     }
 
     promise_test(function (test) {
-        var script = 'data:text/html,' +
+        var script =
           '<script>' +
           '    window.onmessage = function(e) {' +
           '        navigator.requestMediaKeySystemAccess("' + config.keysystem + '", [{' +
           '           initDataTypes: [\"' + config.initDataType + '\"],' +
           '           audioCapabilities: [' +
           '               { contentType:\'' + config.audioType + '\'},' +
           '           ]' +
           '       }]).then(function(access) {' +
@@ -48,17 +48,17 @@ function runTest(config) {
             initDataTypes: [config.initDataType],
             audioCapabilities: [
                 {contentType: config.audioType},
             ]
         }]).then(function (access) {
             return access.createMediaKeys();
         }).then(function (mediaKeys) {
             // Success, so now create the iframe and try there.
-            return load_iframe(script, 'allow-scripts');
+            return load_iframe(script, 'allow-scripts allow-secure-context');
         }).then(function (iframe) {
             iframe.contentWindow.postMessage({}, '*');
             return wait_for_message();
         }).then(function (message) {
             assert_equals(message.result, 'failed');
         });
     }, 'Unique origin is unable to create MediaKeys');
 }