https://bugs.webkit.org/show_bug.cgi?id=105752

SelectorChecker knew too much about visited links and how links are stored in DOM. This change
moves the code to more relevant locations and moves the visited links cache all the way up to Document,
introducing VisitedLinkState class to manage the state of visited links.

Reviewed by Antti Koivisto.

No change in behavior, covered by existing tests.

* CMakeLists.txt: Added VisitedLinkState to build system.
* GNUmakefile.list.am: Ditto.
* Target.pri: Ditto.
* WebCore.gypi: Ditto.
* WebCore.xcodeproj/project.pbxproj: Ditto.
* css/SelectorChecker.cpp: Moved visited-link state code out to VisitedLinkState class.
* css/SelectorChecker.h: Ditto.
* css/StyleResolver.cpp:
(WebCore::StyleResolver::initElement): Changed callsite to use VisitedLinkState.
* css/StyleResolver.h: Removed plumb-throughs that are now unnecessary.
* dom/DOMAllInOne.cpp: Added VisitedLinkState to build system.
* dom/Document.cpp: Added VisitedLinkState initalizer.
* dom/Document.h: Added VisitedLinkState member.
* dom/VisitedLinkState.cpp: Added.
* dom/VisitedLinkState.h: Added.
* history/CachedPage.cpp:
(WebCore::CachedPage::restore): Changed callsite to use VisitedLinkState.
* page/Page.cpp:
(WebCore::Page::allVisitedStateChanged): Ditto.
(WebCore::Page::visitedStateChanged): Ditto.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138509 268f45cc-cd09-0410-ab3c-d52691b4dbfc