Implement a PopStateEvent constructor for JSC

Implement a PopStateEvent constructor for JSC
https://bugs.webkit.org/show_bug.cgi?id=67977

Reviewed by Sam Weinig.

Source/WebCore:

Test: fast/events/constructors/pop-state-event-constructor.html

* bindings/generic/EventConstructors.h: Added a definition for the PopStateEvent constructor.
* bindings/js/JSEventConstructors.cpp: Added #includes for PopStateEvent.
* dom/PopStateEvent.cpp:
(WebCore::PopStateEventInit::PopStateEventInit):
(WebCore::PopStateEvent::PopStateEvent):
(WebCore::PopStateEvent::create):
* dom/PopStateEvent.h: Added a definition for PopStateEventInit.
* dom/PopStateEvent.idl: Makes PopStateEvent constructible.

LayoutTests:

pop-state-event-constructor.html checks the behavior of the PopStateEvent constructor.

* fast/events/constructors/pop-state-event-constructor-expected.txt: Added.
* fast/events/constructors/pop-state-event-constructor.html: Added.
* platform/chromium/test_expectations.txt: Skipped pop-state-event-constructor.html, since V8 does not yet have the PopStateEvent constructor.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95262 268f45cc-cd09-0410-ab3c-d52691b4dbfc