[Navigation API] several ordering-and-transition/ should expect to signal abort

[natechapin]

Test List

navigation-api/ordering-and-transition/anchor-download-intercept-reject.html
navigation-api/ordering-and-transition/back-same-document-intercept-reject.html
navigation-api/ordering-and-transition/location-href-intercept-reject.html
navigation-api/ordering-and-transition/navigate-same-document-intercept-reject.html
navigation-api/ordering-and-transition/reload-intercept-reject.html

Rationale

These tests incorporated incorrect chromium behavior, which skipped the first few steps of abort a NavigateEvent when the navigate event failed due to an intercept handler rejecting (in particular step 2: Signal abort on event's abort controller given reason.).

Proposed test changes
Proposed chromum fix

[jnjaeschke]

r+ for Gecko. Thanks!

[gsnedders]

r+ for WebKit, too.