[Bug 1228250]

[Masayuki]

Okay, now, I think that 2-2 is the best here because:

1. if we ban diagonal wheel events with specific modifier key, horizontal scroll might be too slow if the device can cause diagonal scroll easily (even if user expects only vertical scroll).
2. if we also take deltaX as horizontal scroll, horizontal scroll might be too fast if user does diagonal scroll.

Then, we can treat the new action as simple default action. I'll rewrite
the implementation of ESM::WheelPrefs.

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Title:
  [Shift + Mouse-Scroll-Wheel] Does NOT Scroll Horizontally

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