https://bugs.webkit.org/show_bug.cgi?id=121891

Reviewed by Andreas Kling.

Remove an unsused Shadow DOM type.

* DerivedSources.make:
* WebCore.exp.in:
* WebCore.xcodeproj/project.pbxproj:
* html/HTMLDetailsElement.cpp:
* html/HTMLSummaryElement.cpp:
* html/HTMLTagNames.in:
* html/shadow/ContentDistributor.cpp:
* html/shadow/HTMLContentElement.cpp: Removed.
* html/shadow/HTMLContentElement.h: Removed.
* html/shadow/HTMLContentElement.idl: Removed.
* html/shadow/InsertionPoint.h:
(WebCore::InsertionPoint::matchTypeFor):
* testing/Internals.cpp:
* testing/Internals.h:
* testing/Internals.idl:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@156381 268f45cc-cd09-0410-ab3c-d52691b4dbfc