https://bugs.webkit.org/show_bug.cgi?id=125869

Reviewed by Anders Carlsson.

This is not currently supported by WebKit, remove this enum value.
We can always add this back later if/when we add support for this state.

Source/WebCore: 

* page/PageVisibilityState.cpp:
(WebCore::pageVisibilityStateString):
* page/PageVisibilityState.h:
    - removed PageVisibilityStateUnloaded

Source/WebKit/mac: 

* WebView/WebView.mm:
(core):
(kit):
* WebView/WebViewPrivate.h:
    - removed PageVisibilityStateUnloaded/WebPageVisibilityStateUnloaded

Source/WebKit2: 

* Shared/API/c/WKPageVisibilityTypes.h:
* Shared/API/c/WKSharedAPICast.h:
(WebKit::toPageVisibilityState):
    - removed PageVisibilityStateUnloaded/kWKPageVisibilityStateUnloaded

Tools: 

* DumpRenderTree/mac/TestRunnerMac.mm:
(TestRunner::setPageVisibility):
* TestWebKitAPI/Tests/WebKit2/PageVisibilityState.cpp:
(TestWebKitAPI::didRunStep3StateChangePrerenderToUnloaded):
* WebKitTestRunner/InjectedBundle/TestRunner.cpp:
(WTR::TestRunner::setPageVisibility):
    - remove test for visibility state "unloaded"; this is no longer supported (it never really was).

LayoutTests: 

* fast/events/page-visibility-transition-test-expected.txt:
* fast/events/page-visibility-transition-test.html:
    - remove test for visibility state "unloaded"; this is no longer supported (it never really was).



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160731 268f45cc-cd09-0410-ab3c-d52691b4dbfc