Implement a PopStateEvent constructor for V8

Implement a PopStateEvent constructor for V8
https://bugs.webkit.org/show_bug.cgi?id=68896

Patch by Kentaro Hara <haraken@chromium.org> on 2011-09-28
Reviewed by Adam Barth.

Source/WebCore:

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

* bindings/v8/custom/V8EventConstructors.cpp: Added a PopStateEvent constructor.
* dom/PopStateEvent.idl: Added a 'V8CustomConstructor' attribute.

LayoutTests:

Enabled pop-state-event-constructor.html, since now V8 has the PopStateEvent constructor.

* platform/chromium/test_expectations.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96212 268f45cc-cd09-0410-ab3c-d52691b4dbfc