Get rid of Node::preDispatchEventHandler and Node::postDispatchEventHandler

Get rid of Node::preDispatchEventHandler and Node::postDispatchEventHandler
https://bugs.webkit.org/show_bug.cgi?id=122144

Reviewed by Darin Adler.

Get rid of pre/post event dispatch callbacks preDispatchEventHandler and postDispatchEventHandler since
the former was only called by HTMLMediaElement and HTMLInputElement and the latter was only called by
HTMLInputElement.

Explicitly call HTMLMediaElement's willDispatchFullScreenChangeEvent in fullScreenChangeDelayTimerFired
of Document since this is the only place that fires the fullscreenchange event.

Also add an explicit call to willDispatchEvent and didDispatchClickEvent in EventDispatcher::dispatch.
This also allows us to stack-allocate InputElementClickHandlingState instead of having willDispatchEvent
heap-allocate it and pass it around as void*.

* WebCore.order:
* dom/Document.cpp:
(WebCore::Document::fullScreenChangeDelayTimerFired):
(WebCore::Document::dispatchFullScreenChangeOrErrorEvent):
* dom/Document.h:
* dom/EventContext.cpp:
* dom/EventDispatcher.cpp:
(WebCore::EventDispatcher::dispatch):
(WebCore::EventDispatcher::callWillDispatchEventOnInputElement):
(WebCore::EventDispatcher::dispatchEventPostProcess):
* dom/EventDispatcher.h:
* html/CheckboxInputType.cpp:
(WebCore::CheckboxInputType::willDispatchClick):
* html/CheckboxInputType.h:
* html/HTMLInputElement.cpp:
(WebCore::HTMLInputElement::willDispatchEvent):
(WebCore::HTMLInputElement::didDispatchClickEvent):
* html/HTMLInputElement.h:
* html/HTMLMediaElement.cpp:
* html/HTMLMediaElement.h:
(WebCore::HTMLMediaElement::willDispatchFullScreenChangeEvent): Renamed from preDispatchEventHandler.
* html/HTMLTextFormControlElement.h:
* html/InputType.cpp:
(WebCore::InputType::willDispatchClick):
* html/InputType.h:
* html/RadioInputType.cpp:
(WebCore::RadioInputType::willDispatchClick):
* html/RadioInputType.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@156825 268f45cc-cd09-0410-ab3c-d52691b4dbfc