The array-like types introduced along with WebGL such as Float32Array were split off into a separate specification a few months ago, and the type names changed from WebGL<T>Array to <T>Array. Compatibility code was left in place, but at this point, because the introduction of the shader validator will require content to be updated, it should be deleted.
Accidentally double-clicked submit button. *** This bug has been marked as a duplicate of bug 43885 ***