Request for review: 7124543 [macosx] Horizontal scrolling doesn't work

[Alexander Potochkin]

Hello Sergey
> Hi Everyone,
> - Now we take into account native horizontal scroll event and invert 
> the SHIFT modifier state.
> - scrollAmount was changed from 3 to 1 to be closer to apple jdk 6.

There is one more "3" hardcoded for mouseWheelEvent,
see LWComponentPeer.createDelegateEvent()

could you also change it please?

Thanks
alexp

> - small cleanup.
>
> Bug: http://monaco.sfbay.sun.com/detail.jsf?cr=7124543
> Webrev can be found at: 
> http://cr.openjdk.java.net/~serb/7124543/webrev.00/
>