[NaCl SDK] nacl_io: Remove duplication between passthroughfs and devfs.

native_client_sdk/src/examples/tutorial/testing/example.js

Index: native_client_sdk/src/examples/tutorial/testing/example.js
diff --git a/native_client_sdk/src/examples/tutorial/testing/example.js b/native_client_sdk/src/examples/tutorial/testing/example.js
index 627c5ca4fa4f457bdf6c33cee27ce98eaa9c66e3..b51b98856385c8efb53109dbdc3cd8b2b5704926 100644
--- a/native_client_sdk/src/examples/tutorial/testing/example.js
+++ b/native_client_sdk/src/examples/tutorial/testing/example.js
@@ -45,9 +45,14 @@ function handleMessage(event) {
   var msg = event.data;
   var firstColon = msg.indexOf(':');
   var cmd = msg.substr(0, firstColon);
+
+  if (cmd == 'testend') {
+    event.srcElement.postMessage({'testend' : ''});
+    return;
+  }
+
   var cmdFunctionName = cmd + 'Command';
   var cmdFunction = window[cmdFunctionName];
-
   if (typeof(cmdFunction) !== 'function') {
     console.log('Unknown command: ' + cmd);
     console.log('  message: ' + msg);