Test for slicing blobs created by BlobBuilder sending them via XMLHttpRequest.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

* BlobBuilder.append(data) and then apply Blob.slice()
PASS Expected response data received: OK
PASS Expected response data received: OK
PASS Expected response data received: OK
PASS Expected response data received: OK
PASS Expected response data received: OK
* BlobBuilder.append(data) and then apply nested Blob.slice()
PASS Expected response data received: OK
PASS Expected response data received: OK
PASS successfullyParsed is true

TEST COMPLETE