Remove unnecessary wxToolbook::m_maxBitmapSize

We don't need to keep track of the bitmap size and call
SetToolBitmapSize() ourselves, wxToolBar should be (and is) able to do
it on its own.

include/wx/toolbook.h

@@ -115,9 +115,6 @@ protected:
     // whether the toolbar needs to be realized
     bool m_needsRealizing;
 
-    // maximum bitmap size
-    wxSize m_maxBitmapSize;
-
 private:
     // common part of all constructors
     void Init();

src/generic/toolbkg.cpp

@@ -200,8 +200,6 @@ void wxToolbook::Realize()
     {
         m_needsRealizing = false;
 
-        GetToolBar()->SetToolBitmapSize(m_maxBitmapSize);
-
         GetToolBar()->Realize();
     }
 
@@ -289,11 +287,7 @@ bool wxToolbook::InsertPage(size_t n,
     bitmap.CopyFromIcon(icon);
 #endif
 
-    m_maxBitmapSize.x = wxMax(bitmap.GetWidth(), m_maxBitmapSize.x);
-    m_maxBitmapSize.y = wxMax(bitmap.GetHeight(), m_maxBitmapSize.y);
-
     int toolId = page->GetId();
-    GetToolBar()->SetToolBitmapSize(m_maxBitmapSize);
     GetToolBar()->InsertTool(n, toolId, text, bitmap, wxNullBitmap, wxITEM_RADIO);
 
     // fix current selection