String to OUString

Change-Id: I0adbe625400f71eb8cb21d0b36a117c708348a20
Reviewed-on: https://gerrit.libreoffice.org/5875Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/source/filter/ww8/attributeoutputbase.hxx

@@ -339,7 +339,7 @@ public:
 
 protected:
 
-    void GetNumberPara( String& rStr, const SwField& rFld );
+    void GetNumberPara( OUString& rStr, const SwField& rFld );
 
     /// Output frames - the implementation.
     virtual void OutputFlyFrame_Impl( const sw::Frame& rFmt, const Point& rNdTopLeft ) = 0;