Avoid uncommon C++ style of forward declaration combined with its use

Change-Id: I870821ec64653391caf516cbd3aa890637d7dd24
Reviewed-on: https://gerrit.libreoffice.org/17367Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>

vcl/inc/generic/glyphcache.hxx

@@ -37,6 +37,7 @@
 
 #include <unordered_map>
 
+class FreetypeManager;
 class FtFontInfo;
 class GlyphCachePeer;
 class GlyphData;
@@ -99,7 +100,7 @@ private:
     mutable int             mnGlyphCount;
     ServerFont*             mpCurrentGCFont;
 
-    class FreetypeManager*  mpFtManager;
+    FreetypeManager*        mpFtManager;
 };
 
 class GlyphMetric

vcl/inc/quartz/salgdi.h

@@ -48,6 +48,7 @@
 class AquaSalFrame;
 class ImplDevFontAttributes;
 class CoreTextStyle;
+class XorEmulation;
 
 typedef sal_uInt32 sal_GlyphId;
 typedef std::vector<unsigned char> ByteVector;
@@ -146,7 +147,7 @@ protected:
     CGLayerRef                              mxLayer;    // Quartz graphics layer
     CGContextRef                            mrContext;  // Quartz drawing context
     int                                     mnContextStackDepth;
-    class XorEmulation*                     mpXorEmulation;
+    XorEmulation*                           mpXorEmulation;
     int                                     mnXorMode; // 0: off 1: on 2: invert only
     int                                     mnWidth;
     int                                     mnHeight;

vcl/unx/generic/dtrans/X11_selection.hxx

@@ -47,6 +47,7 @@
 namespace x11 {
 
     class PixmapHolder; // in bmp.hxx
+    class SelectionManager;
 
     rtl_TextEncoding getTextPlainEncoding( const OUString& rMimeType );
 
@@ -76,7 +77,7 @@ namespace x11 {
         bool                        m_bActive;
         sal_Int8                    m_nDefaultActions;
         ::Window                    m_aTargetWindow;
-        class SelectionManager*     m_pSelectionManager;
+        SelectionManager*           m_pSelectionManager;
         css::uno::Reference< css::datatransfer::dnd::XDragSource >
                                     m_xSelectionManager;
         ::std::list< css::uno::Reference< css::datatransfer::dnd::XDropTargetListener > >