Simple BlobBuilder fallback for Blob

blob.fallback.js

// Simple BlobBuilder fallback for Blob
if(!__support.Blob) {
    // BlobBuilder fallback for Blob
    (function(blob) {
        blob = function(data, obj) {
            var n;

            // Fallback for BlobBuilder
            while ((i -= 1) > -1) {
                window.BlobBuilder = window.BlobBuilder || window[prefixes[i] + 'BlobBuilder'];
            }

            var builder = new BlobBuilder;

            // Append the data
            for (n in data) {
                builder.append(data[n]);
            }

            // Return the blob
            return builder.getBlob((obj && obj.type) ? obj.type : undefined);
        }
    })(window.Blob);
}