Remove obsolete fw declarations from embeddedobj/ extensions/

found with bin/find-unneeded-includes --fwdecl

Change-Id: I029145e0f04b1ed90bb0d16c871891bca85b39a5
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/183885
Tested-by: Jenkins
Reviewed-by: Gabor Kelemen <gabor.kelemen.extern@allotropia.de>

embeddedobj/source/inc/commonembobj.hxx

@@ -47,12 +47,6 @@ namespace com::sun::star {
     namespace embed {
         class XStorage;
     }
-    namespace lang {
-        class XMultiServiceFactory;
-    }
-    namespace util {
-        class XCloseListener;
-    }
     namespace beans {
         struct PropertyValue;
         struct NamedValue;
@@ -72,8 +66,6 @@ namespace comphelper {
 
 #include "docholder.hxx"
 
-namespace embeddedobj { class Interceptor; }
-
 /**
  * Represents an OLE object that has native data and we loaded that data into a
  * document model successfully.

embeddedobj/source/inc/dummyobject.hxx

@@ -35,13 +35,6 @@ namespace com::sun::star {
     namespace embed {
         class XStorage;
     }
-    namespace util {
-        class XCloseListener;
-    }
-    namespace beans {
-        struct PropertyValue;
-        struct NamedValue;
-    }
 }
 
 /**