Fix fetch-canvas-tainting.html to not mix up origins and transferables.

LayoutTests/http/tests/serviceworker/fetch-canvas-tainting.html

Index: LayoutTests/http/tests/serviceworker/fetch-canvas-tainting.html
diff --git a/LayoutTests/http/tests/serviceworker/fetch-canvas-tainting.html b/LayoutTests/http/tests/serviceworker/fetch-canvas-tainting.html
index b0ea0cb0e312a8300cf59e435c3dcb865b42a974..abb5e2b32f0fe0f43b419be4a6e6be54bbaa3baa 100644
--- a/LayoutTests/http/tests/serviceworker/fetch-canvas-tainting.html
+++ b/LayoutTests/http/tests/serviceworker/fetch-canvas-tainting.html
@@ -34,8 +34,8 @@ async_test(function(t) {
                   service_worker_unregister_and_done(t, SCOPE);
                 });
               frame.contentWindow.postMessage({},
-                                              [channel.port2],
-                                              host_info['HTTP_ORIGIN']);
+                                              host_info['HTTP_ORIGIN'],
+                                              [channel.port2]);
             });
         })
       .catch(unreached_rejection(t));