Tests frameStartedNavigating events when navigation is initiated by renderer
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 0>
        navigationType : differentDocument
        url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-1.html
    }
    sessionId : <string>
}
frameRequestedNavigation {
    frameId : <string>
    url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html
}
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 1>
        navigationType : differentDocument
        url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html
    }
    sessionId : <string>
}
frameRequestedNavigation {
    frameId : <string>
    url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html?step=1
}
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 2>
        navigationType : differentDocument
        url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html?step=1
    }
    sessionId : <string>
}
frameRequestedNavigation {
    frameId : <string>
    url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html?step=2
}
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 3>
        navigationType : differentDocument
        url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html?step=2
    }
    sessionId : <string>
}
frameRequestedNavigation {
    frameId : <string>
    url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html?step=3
}
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 4>
        navigationType : differentDocument
        url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html?step=3
    }
    sessionId : <string>
}
frameRequestedNavigation {
    frameId : <string>
    url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html?step=4
}
frameStartedNavigating {
    method : Page.frameStartedNavigating
    params : {
        frameId : <string>
        loaderId : <string 5>
        navigationType : differentDocument
        url : http://127.0.0.1:8000/inspector-protocol/page/resources/frame-requested-navigation-2.html?step=4
    }
    sessionId : <string>
}