Use a valid WebMouseWheelEvent in stringification test

Use a valid WebMouseWheelEvent in stringification test

Use a proper WebMouseWheelEvent instance when validating the ToString
behavior for events of type WebInputEvent::MouseWheel.

BUG=422083
Committed: https://crrev.com/b2bdb2f4eee5b8c729335e8ef2e1832a6fde1e28
Cr-Commit-Position: refs/heads/master@{#299038}

[jdduke (slow), 2014-10-09 23:05:56]

jdduke@chromium.org changed reviewers:
+ bruening@chromium.org

[jdduke (slow), 2014-10-09 23:05:56]

bruening@: PTAL, thanks.

[Derek Bruening, 2014-10-09 23:24:12]

Suppression removal looks good.  I don't know enough about WebMouseEvent vs
WebMouseWheelEvent for that part.

[jdduke (slow), 2014-10-10 00:03:15]

jdduke@chromium.org changed reviewers:
+ aelias@chromium.org

[jdduke (slow), 2014-10-10 00:03:16]

+aelias@ for content/common/input

[aelias_OOO_until_Jul13, 2014-10-10 00:22:24]

lgtm

[jdduke (slow), 2014-10-10 01:32:08]

The CQ bit was checked by jdduke@chromium.org

[commit-bot: I haz the power, 2014-10-10 01:34:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/642483003/1

[commit-bot: I haz the power, 2014-10-10 02:03:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-10 02:05:11]

Patchset 1 (id:??) landed as
https://crrev.com/b2bdb2f4eee5b8c729335e8ef2e1832a6fde1e28
Cr-Commit-Position: refs/heads/master@{#299038}