Add a stubbed out WebVisitedLinkStore class on Windows
https://bugs.webkit.org/show_bug.cgi?id=139078

Reviewed by Sam Weinig.

Source/WebKit:

* WebKit.vcxproj/WebKit/WebKit.vcxproj:

Source/WebKit/win:

* WebCoreSupport/WebVisitedLinkStore.cpp: Added.
(WebVisitedLinkStore::shared):
(WebVisitedLinkStore::WebVisitedLinkStore):
(WebVisitedLinkStore::~WebVisitedLinkStore):
(WebVisitedLinkStore::isLinkVisited):
(WebVisitedLinkStore::addVisitedLink):
* WebCoreSupport/WebVisitedLinkStore.h: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@176573 268f45cc-cd09-0410-ab3c-d52691b4dbfc