Remove redundant Mac event structures

Remove redundant Mac event structures

The scrollCount field is unused.

The unacceleratedScrollingDeltaX/Y field always equal deltaX/Y (by
inspection, then by adding an assert and testing), so use those
directly.

BUG=133097
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183851

[ccameron, 2014-10-16 02:09:58]

ccameron@chromium.org changed reviewers:
+ kbr@chromium.org

[ccameron, 2014-10-16 02:13:08]

Very small simplification, but helps a bit in slogging through.

[ccameron, 2014-10-17 00:28:12]

ping on this guy

[Ken Russell (switch to Gerrit), 2014-10-17 00:56:10]

LGTM if you've tested this. The math looks right.

[ccameron, 2014-10-17 01:08:07]

Thanks!

[ccameron, 2014-10-17 01:08:08]

Thanks!

[ccameron, 2014-10-17 01:08:10]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-10-17 01:09:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/658953003/1

[commit-bot: I haz the power, 2014-10-17 02:21:30]

Committed patchset #1 (id:1) as 183851