basegfx: move ImplB2DPolyPolygon inside basegfx namespace

also remove unneeded typedef

Change-Id: I24fd31ff9da579260f1889ed87065f95dcfd1e23
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/134377
Tested-by: Tomaž Vajngerl <quikee@gmail.com>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

basegfx/source/polygon/b2dpolypolygon.cxx

@@ -27,6 +27,9 @@
 #include <basegfx/matrix/b2dhommatrix.hxx>
 #include <basegfx/utils/systemdependentdata.hxx>
 
+namespace basegfx
+{
+
 class ImplB2DPolyPolygon
 {
     basegfx::B2DPolygonVector                               maPolygons;
@@ -197,9 +200,6 @@ public:
     }
 };
 
-namespace basegfx
-{
-
     static o3tl::cow_wrapper<ImplB2DPolyPolygon> DEFAULT;
 
     B2DPolyPolygon::B2DPolyPolygon() :

include/basegfx/polygon/b2dpolypolygon.hxx

@@ -28,22 +28,15 @@
 #include <basegfx/basegfxdllapi.h>
 #include <basegfx/polygon/b2dpolygon.hxx>
 
-class ImplB2DPolyPolygon;
-
 namespace basegfx
 {
     class B2DHomMatrix;
-}
+    class ImplB2DPolyPolygon;
 
-namespace basegfx
-{
     class BASEGFX_DLLPUBLIC B2DPolyPolygon
     {
-    public:
-        typedef o3tl::cow_wrapper< ImplB2DPolyPolygon > ImplType;
-
     private:
-        ImplType                                        mpPolyPolygon;
+        o3tl::cow_wrapper<ImplB2DPolyPolygon> mpPolyPolygon;
 
     public:
         B2DPolyPolygon();