fix(calendar): remove non-working VoiceOver fix hack

Author: jelbourn

src/components/calendar/calendar.js

@@ -243,16 +243,7 @@
   /** Attach event listeners for the calendar. */
   CalendarCtrl.prototype.attachCalendarEventListeners = function() {
     // Keyboard interaction.
-    //this.calendarElement.addEventListener('keydown', angular.bind(this, this.handleKeyEvent));
     this.$element.on('keydown', angular.bind(this, this.handleKeyEvent));
-
-    var self = this;
-    this.calendarScroller.addEventListener('scroll', function() {
-      if (self.calendarScroller.scrollTop == 0 &&
-          !self.dateUtil.isSameMonthAndYear(firstRenderableDate, self.displayDate)) {
-        self.changeDisplayDate(self.displayDate);
-      }
-    });
   };
 
   /*** User input handling ***/