what's the difference between Blob and Blobbuilder or Blobbuilder's issue on android native browser

The question is not duplicate from What's the difference between BlobBuilder and the new Blob constructor?

I'm doing web app. To upload image I use Blob, just in case BlobBuilder too. Blob works well, but Blob doesn't work on android native browser, android native browser uses BlobBuilder. I expected, Blob and BlobBuilder returns the same blob, but they didn't. Here is my code:

base64toBlob: function(b64Data, contentType, sliceSize) {
  var BlobBuilder, blob, byteArray, byteCharacters, byteNumbers, charCodeFromCharacter, err, posIndex;

  if (contentType == null) {
    contentType = '';
  }
  if (sliceSize == null) {
    sliceSize = 1024;
  }
  posIndex = b64Data.indexOf('base64,');
  if (posIndex !== -1) {
    b64Data = b64Data.substring(posIndex + 7);
  }
  charCodeFromCharacter = function(c) {
    return c.charCodeAt(0);
  };
  byteCharacters = atob(b64Data.replace(/\s/g, ''));
  byteNumbers = Array.prototype.map.call(byteCharacters, charCodeFromCharacter);
  byteArray = new Uint8Array(byteNumbers);
  try {
    blob = new Blob([byteArray.buffer], {
      type: contentType
    });
    return blob;
  } catch (_error) {
    err = _error;
    BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder;
    blob = new BlobBuilder();
    blob.append(byteArray.buffer);
    return blob.getBlob(contentType);
  }
}

I did logs when I send request

blobImg = base64toBlob(base64Data, imageType);
alert(JSON.stringify(blobImg));
// alert shows {"type": "image/jpeg", "size": 10251 } when blob worked
// alert shows {"type": "image/jpeg", "size": 27822 } when blobbuilder worked
ajaxRequest.send(blobImg);

I tried to upload at the same image on all browsers. On Chrome and other browsers I get from log {"type": "image/jpeg", "size": 10251 } and request send successfully, but on android native browser i get {"type": "image/jpeg", "size": 27822 } and request failed with status code 0. On android browser works catch part (I guess, it means Android native browser does not support Blob) I tested in android 4.1.2. I found nothing from google about the issue. I will glad If somebody help me!