It wasn't doing anything.

Fixes <http://webkit.org/b/52752> WKCACFContextFlusher is unused

Reviewed by Simon Fraser.

* WebCore.vcproj/WebCore.vcproj: Removed WKCACFContextFlusher. Also let VS have its way with
the file.

* platform/graphics/win/WKCACFContextFlusher.cpp: Removed.
* platform/graphics/win/WKCACFContextFlusher.h: Removed.

* platform/graphics/win/WKCACFLayerRenderer.cpp:
(WebCore::WKCACFLayerRenderer::~WKCACFLayerRenderer):
(WebCore::WKCACFLayerRenderer::layerTreeDidChange):
Stop telling WKCACFContextFlusher about our context, since it never did anything with it.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@76258 268f45cc-cd09-0410-ab3c-d52691b4dbfc