[Gtk] Add computedStyleIncludingVisitedInfo to DumpRenderTreeSupport

[Gtk] Add computedStyleIncludingVisitedInfo to DumpRenderTreeSupport
https://bugs.webkit.org/show_bug.cgi?id=81232

Patch by Zan Dobersek <zandobersek@gmail.com> on 2012-03-16
Reviewed by Philippe Normand.

Source/WebKit/gtk:

Add computedStyleIncludingVisitedInfo helper method to
DumpRenderTreeSupportGtk.

* WebCoreSupport/DumpRenderTreeSupportGtk.cpp:
(DumpRenderTreeSupportGtk::computedStyleIncludingVisitedInfo):
* WebCoreSupport/DumpRenderTreeSupportGtk.h:
(DumpRenderTreeSupportGtk):

Tools:

Use the newly-added helper method in DumpRenderTreeSupportGtk.

* DumpRenderTree/gtk/LayoutTestControllerGtk.cpp:
(LayoutTestController::computedStyleIncludingVisitedInfo):

LayoutTests:

Unskip now-passing tests.

* platform/gtk/Skipped:
* platform/gtk/fast/history/nested-visited-test-expected.txt: Removed.
* platform/gtk/fast/history/self-is-visited-expected.txt: Removed.
* platform/gtk/fast/history/sibling-visited-test-expected.txt: Removed.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@110960 268f45cc-cd09-0410-ab3c-d52691b4dbfc