Reviewed by Dan Bernstein.

        Removed ENABLE(SINGLE_THREADED) support, since it is always false
        https://bugs.webkit.org/show_bug.cgi?id=67862

        Next step toward making the baseline platform assumption that threads exist.

        * wtf/wtf.pri:
        * JavaScriptCore.gypi:
        * JavaScriptCore.vcproj/WTF/WTF.vcproj: Removed references to
        ThreadingNone.cpp, which was only compiled in single-threaded mode.

        * wtf/Platform.h:
        * wtf/ThreadSpecific.h:
        (WTF::::destroy):
        * wtf/qt/ThreadingQt.cpp: Removed now-dead code.

        * wtf/ThreadingNone.cpp: Removed.
2011-09-09  Geoffrey Garen  <ggaren@apple.com>

        Reviewed by Dan Bernstein.

        Removed ENABLE(SINGLE_THREADED) support, since it is always false
        https://bugs.webkit.org/show_bug.cgi?id=67862

        Next step toward making the baseline platform assumption that threads exist.

        * WebCore.pri:
        * features.pri: 
        * platform/sql/SQLiteDatabase.cpp:
        (WebCore::SQLiteDatabase::interrupt): Removed now-dead code.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@94890 268f45cc-cd09-0410-ab3c-d52691b4dbfc