Version:  57.0.2935.0 canary (64-bit)
OS: Mac OS X 10.10

What steps will reproduce the problem?
Visit http://w3c-test.org/presentation-api/controlling-ua/PresentationRequest_error.html

What is the expected result?
Test case #3 passes

What happens instead?
Test case #3 fails

assert_throws: function "function () { new PresentationRequest('http://@'); }" threw object "TypeError: Failed to construct 'PresentationRequest': 'http://@' can't be resolved to a valid URL." that is not a DOMException SyntaxError: property "code" is equal to undefined, expected 12
    at Test.<anonymous> (http://w3c-test.org/presentation-api/controlling-ua/PresentationRequest_error.html:23:9)
    at Test.step (http://w3c-test.org/resources/testharness.js:1406:25)
    at test (http://w3c-test.org/resources/testharness.js:501:18)
    at http://w3c-test.org/presentation-api/controlling-ua/PresentationRequest_error.html:22:5