[Bug 1228250]

[Masayuki]

Sorting out my concern:

1. Many people still want this in these days?
2. If it's not enabled in default settings, how many people would use (realize) this feature?
3. If it doesn't swap DOM wheel event's delta values, users won't scroll custom scrollable elements implemented with JS horizontally.
4. If it's enabled in default settings, web applications NEVER receive raw delta values with Shift key or other modifier. It's very bad thing for web application developers. E.g., game developers.
5. Swapping delta value may be broken easy at maintaining nsEventStateManager. For preventing it, we need a lot of automated tests as far as possible.

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https://bugs.launchpad.net/bugs/1228250

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

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