Fix swipe navigation in Yosemite (fixes #272)

Fix based upon Chromium's related issue of swipe tracking being broken
by Yosemite [1].

TODO:

- Test updated swipe navigation on 10.9 and earlier
- Test swipe navigation with Magic Mouse
- Test swipe navigation with system three-finger swipe

[1]:
https://codereview.chromium.org/600743003/diff/40001/chrome/browser/rend
erer_host/chrome_render_widget_host_view_mac_history_swiper.mm?context=1
0&column_width=80&tab_spaces=8