Replace many identical wxBitmap::CopyFromIcon() with a single one

Define CopyFromIcon() directly in wxBitmapBase for the non-MSW ports, as
it was implemented exactly in the same way in all ports using this class
anyhow.

This means this function is not virtual any longer, but this shouldn't
be a problem as it was never supposed to be overridden in application
code and this couldn't be done with wxMSW, where it never was virtual in
the first place, anyhow.

No real changes, just a simplification.

include/wx/bitmap.h

@@ -223,7 +223,7 @@ public:
 #endif // wxUSE_PALETTE
 
     // copies the contents and mask of the given (colour) icon to the bitmap
-    virtual bool CopyFromIcon(const wxIcon& icon) = 0;
+    bool CopyFromIcon(const wxIcon& icon);
 
     // implementation:
 #if WXWIN_COMPATIBILITY_3_0

include/wx/dfb/bitmap.h

@@ -63,9 +63,6 @@ public:
     virtual void SetPalette(const wxPalette& palette);
 #endif
 
-    // copies the contents and mask of the given (colour) icon to the bitmap
-    virtual bool CopyFromIcon(const wxIcon& icon);
-
     static void InitStandardHandlers();
 
     // raw bitmap access support functions

include/wx/gtk/bitmap.h

@@ -103,9 +103,6 @@ public:
     wxImage ConvertToImage() const wxOVERRIDE;
 #endif // wxUSE_IMAGE
 
-    // copies the contents and mask of the given (colour) icon to the bitmap
-    virtual bool CopyFromIcon(const wxIcon& icon) wxOVERRIDE;
-
     wxMask *GetMask() const wxOVERRIDE;
     void SetMask( wxMask *mask ) wxOVERRIDE;
 

include/wx/gtk1/bitmap.h

@@ -88,9 +88,6 @@ public:
 
     wxImage ConvertToImage() const;
 
-    // copies the contents and mask of the given (colour) icon to the bitmap
-    virtual bool CopyFromIcon(const wxIcon& icon);
-
     wxMask *GetMask() const;
     void SetMask( wxMask *mask );
 

include/wx/osx/bitmap.h

@@ -165,9 +165,6 @@ public:
     wxBitmapRefData *GetBitmapData()
         { return (wxBitmapRefData *)m_refData; }
 
-    // copies the contents and mask of the given (colour) icon to the bitmap
-    virtual bool CopyFromIcon(const wxIcon& icon) wxOVERRIDE;
-
     int GetWidth() const wxOVERRIDE;
     int GetHeight() const wxOVERRIDE;
     int GetDepth() const wxOVERRIDE;

include/wx/qt/bitmap.h

@@ -61,9 +61,6 @@ public:
     virtual void SetPalette(const wxPalette& palette) wxOVERRIDE;
 #endif // wxUSE_PALETTE
 
-    // copies the contents and mask of the given (colour) icon to the bitmap
-    virtual bool CopyFromIcon(const wxIcon& icon) wxOVERRIDE;
-
     // implementation:
 #if WXWIN_COMPATIBILITY_3_0
     wxDEPRECATED(virtual void SetHeight(int height) wxOVERRIDE);

include/wx/x11/bitmap.h

@@ -98,9 +98,6 @@ public:
     bool CreateFromImage(const wxImage& image, int depth = -1);
 #endif // wxUSE_IMAGE
 
-    // copies the contents and mask of the given (colour) icon to the bitmap
-    virtual bool CopyFromIcon(const wxIcon& icon);
-
     wxMask *GetMask() const;
     void SetMask( wxMask *mask );