[webkit-reviews] review requested: [Bug 89439] [Forms] Make step action of SpinButtonElement replaceable : [Attachment 148290] Patch 2

[bugzilla-daemon at webkit.org]

yosin at chromium.org has asked  for review:
Bug 89439: [Forms] Make step action of SpinButtonElement replaceable
https://bugs.webkit.org/show_bug.cgi?id=89439

Attachment 148290: Patch 2
https://bugs.webkit.org/attachment.cgi?id=148290&action=review

------- Additional Comments from yosin at chromium.org
Could you review this patch?
Thanks in advance.

= Changes since last patch =
* Rename SpinButtonElement::Callback to StepActionHandler
* SpinButtonElement keeps m_stepActionHandler as pointer and checks it isn't
nullptr before calling action.
* Add SpinButtonElement::removeStepActionHandler
** This method will be called from TextFieldInputType dtor and
destroyShadowSubtree