Tap code be gone!

ios8 [1] has no need for it, neither does Chrome mobile [2]
The existing code doesn't work on IE8 or Blackberry touch/mouse wheel
devices

[1] https://github.com/ftlabs/fastclick/issues/262#issuecomment-56023175
[2] http://updates.html5rocks.com/2013/12/300ms-tap-delay-gone-away

Bug: 72566
Bug: 72645
Change-Id: I049f9ec51f972f595bb6555c5528debb21e4c489
Merge "Tap code be gone!"