Try to fix the following build errors:

            WebIconDatabase.cpp
            ..\WebIconDatabase.cpp(255) : error C3861: 'shutDownIconDatabase': identifier not found
            ..\WebIconDatabase.cpp(258) : error C3861: 'startUpIconDatabase': identifier not found

        * WebIconDatabase.cpp:
        (setEnabled): Add class prefix to startUpIconDatabase() and
        shutDownIconDatabase().
        * WebIconDatabase.h:
        (WebIconDatabase::startUpIconDatabase): Make private again.
        (WebIconDatabase::shutDownIconDatabase): Ditto.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@39647 268f45cc-cd09-0410-ab3c-d52691b4dbfc