Throw an exception when authors pass an unsupported constructor or element to getAutoplayPolicy()

[alastor0325]

This is from here, authors might pass an unsupported parameter to navigator.getAutoplayPolicy(ctor) and navigator.getAutoplayPolicy(object).

When that situation happens, those methods should throw type error, like this example. Currently we only support constructor and element for HTMLMediaElement and AudioContext, all other constructors or elements passed to the methods should cause throwing an exception.