function blobUriToBlob(url) {
		return new Promise(function(resolve) {
			var xhr = new XMLHttpRequest();

			xhr.open('GET', url, true);
			xhr.responseType = 'blob';

			xhr.onload = function() {
				if (this.status == 200) {
					resolve(this.response);
				}
			};

			xhr.send();
		});
	}
Converts blob/uris back and forth.

@private
@class tinymce.file.Conversions