CONFIRM NAVIGATION
CONFIRM NAVIGATION
Tests frameStartedNavigating events with beforeunload

Prepare
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 0>
        navigationType : differentDocument
        url : http://127.0.0.1:8000/inspector-protocol/page/resources/before-unload.html
    }
    sessionId : <string>
}

Fragment navigation
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 1>
        navigationType : sameDocument
        url : http://127.0.0.1:8000/inspector-protocol/page/resources/before-unload.html#some_fragment
    }
    sessionId : <string>
}

Reload
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 2>
        navigationType : reload
        url : http://127.0.0.1:8000/inspector-protocol/page/resources/before-unload.html#some_fragment
    }
    sessionId : <string>
}

Leave beforeunload page
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 3>
        navigationType : differentDocument
        url : http://127.0.0.1:8000/inspector-protocol/resources/empty.html
    }
    sessionId : <string>
}