unix/Daemon, playlist/pls, ...: remove unused Domain variables

src/playlist/plugins/PlsPlaylistPlugin.cxx

@@ -28,14 +28,11 @@
 #include "util/StringUtil.hxx"
 #include "util/DivideString.hxx"
 #include "util/Error.hxx"
-#include "util/Domain.hxx"
 
 #include <string>
 
 #include <stdlib.h>
 
-static constexpr Domain pls_domain("pls");
-
 static bool
 FindPlaylistSection(TextInputStream &is)
 {

src/playlist/plugins/XspfPlaylistPlugin.cxx

@@ -25,14 +25,11 @@
 #include "input/InputStream.hxx"
 #include "tag/TagBuilder.hxx"
 #include "util/Error.hxx"
-#include "util/Domain.hxx"
 #include "lib/expat/ExpatParser.hxx"
 #include "Log.hxx"
 
 #include <string.h>
 
-static constexpr Domain xspf_domain("xspf");
-
 /**
  * This is the state object for our XML parser.
  */