delete useless code in sw/source/code/inc

 - frame.hxx: git grep shows that variable is not used anywhere
 - dflyobj.hxx, frmtool.hxx: redundant visibility declaration
 - layouter.hxx: redundant include (once with "" and once with <>)

sw/source/core/inc/dflyobj.hxx

@@ -87,7 +87,6 @@ public:
     basegfx::B2DRange getOuterBound() const;
     basegfx::B2DRange getInnerBound() const;
 
-public:
     TYPEINFO();
 
     SwVirtFlyDrawObj(SdrObject& rNew, SwFlyFrm* pFly);

sw/source/core/inc/frame.hxx

@@ -368,9 +368,6 @@ protected:
     sal_Bool bCompletePaint : 1;
     sal_Bool bRetouche      : 1; // frame is responsible for retouching
 
-public:
-    sal_Bool bUnUsed2       : 1;
-
 protected:
     sal_Bool bInfInvalid    : 1;  // InfoFlags are invalid
     sal_Bool bInfBody       : 1;  // Frm is in document body

sw/source/core/inc/frmtool.hxx

@@ -158,7 +158,6 @@ protected:
     sal_Bool     bHadFollow;
     sal_Bool     bInvaKeep;
     sal_Bool     bValidSize;
-protected:
     // #i49383#
     bool mbFrmDeleted;
 

sw/source/core/inc/layouter.hxx

@@ -50,7 +50,6 @@ class SwAnchoredObject;
 #include <vector>
 class SwFrm;
 // --> #i65250#
-#include <swtypes.hxx>
 #include <boost/unordered_map.hpp>
 class SwFlowFrm;
 class SwLayoutFrm;