Passing function in service using AngularJS

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Javascript

AngularJs

Hello, I have been experimenting with javascript and I have a question about this:

angular.module('starter.services')
.factory('GameTimerService', function (UtilService) {
    var interval = 1000;


    function doThisEverySecond(myscope, StopTimer)
    {
        if (myscope.rangeValue == 60 || myscope.rangeValue > 5) {
            try {
                MediaService.PlayMedia("sound.mp3");
            }
            catch (e) {
                console.log(e);
            }
            finally {
                StopTimer();
            }
        }
        else {
            myscope.rangeValue++;
        }
    }

    function stopTimer() {
        UtilService.StopTimer();
    }

    return {
        StartTimer : function(myscope) {
            UtilService.StartTimer( function() { doThisEverySecond(myscope, stopTimer); } , interval);
        },

        StopTimer : function()
        {
            stopTimer();
        },
    }
})

It is my angular service and it works great.

But when I change this piece of code:

return {
        StartTimer : function(myscope) {
            UtilService.StartTimer( function() { doThisEverySecond(myscope, stopTimer); } , interval);
        },

        StopTimer : function()
        {
            stopTimer();
        },
    }

for this:

return {
    StartTimer : function(myscope) {
        UtilService.StartTimer( function() { doThisEverySecond(myscope, StopTimer); } , interval);
    },

    StopTimer : function() {
        UtilService.StopTimer();
    },
}

it no longer works.

My question is why?