[Bug 1228250]

[Masayuki]

https://treeherder.mozilla.org/#/jobs?repo=try&revision=57d5864711a2a2bd65130644c9da616017184b58

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

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

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