[FileAPI] FileReader.readAsArrayBuffer(null) should throw a Type Error

[zac spitzer]

Webkit currently just returns, all other major browsers do a type check and throw an error

var reader = new FileReader();
reader.onloadend = function(e) {
  console.log(e);
}
reader.readAsArrayBuffer(null);

https://jsbin.com/zonagopuhi/edit?html,js,console,output

https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/fileapi/FileReader.cpp#L79

Here is the Chrome commit which added type checking for FileReader
https://groups.google.com/a/chromium.org/forum/#!topic/blink-reviews/vZxyVFHJ7MU