Problem with detection of L.Browser.touch in some desktop browsers

[NielsHolt]

It seems that the detection of browser support for touch-event isn't consistent on some desktop browser
On IE11 and Chrome it get set to true while on Firefox it is set to false

Monernizr (https://modernizr.com) use another methods to detect the presents of touch-event and it returns false for all tree browsers:

function() {
    var bool;
    if (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch) {
      bool = true;
    } else {
      // include the 'heartz' as a way to have a non matching MQ to help terminate the join
      // https://git.io/vznFH
      var query = ['@media (', prefixes.join('touch-enabled),('), 'heartz', ')', '{#modernizr{top:9px;position:absolute}}'].join('');
      testStyles(query, function(node) {
        bool = node.offsetTop === 9;
      });
    }
    return bool;
  });

[IvanSanchez]

Duplicate of #5266, #3944 and others.

Not going to take action on this due to the recent work done in the pointerify branch, because worrying about PointerEvents is way more promising than worrying about TouchEvents