[Bug 1228250]

[Masayuki]

https://treeherder.mozilla.org/#/jobs?repo=try&revision=554cd7fe7479c2cad7a3e246280eaf611a8c59f1

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

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

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