EME: Fix the CDM File IO test when run using unprefixed EME.

media/test/data/eme_player_js/player_utils.js

Index: media/test/data/eme_player_js/player_utils.js
diff --git a/media/test/data/eme_player_js/player_utils.js b/media/test/data/eme_player_js/player_utils.js
index b9f1732cc1890aa3bce667d83dedea69e48d14d6..81332caaee1941b6122815090e7b6ce5b3e633b6 100644
--- a/media/test/data/eme_player_js/player_utils.js
+++ b/media/test/data/eme_player_js/player_utils.js
@@ -98,6 +98,11 @@ PlayerUtils.registerEMEEventListeners = function(player) {
   player.video.receivedKeyMessage = false;
   Utils.timeLog('Setting video media keys: ' + player.testConfig.keySystem);
   var config = {};
+  // The File IO test requires persistent state support.
+  if (player.testConfig.keySystem ==
+      'org.chromium.externalclearkey.fileiotest') {
+    config = {persistentState: "required"};
+  }
   if (player.testConfig.sessionToLoad) {
     config = {
         persistentState: "required",