Wx BitmapFromBufferRGBA deprecated in favor of Bitmap.FromBufferRGBA

[rahulporuri]

c:\users\rporuri\work\github\ets\chaco\chaco\tools\toolbars\toolbar_buttons.py:190: wxPyDeprecationWarning: Call to deprecated item BitmapFromBufferRGBA. Use :meth:`wx.Bitmap.FromBufferRGBA` instead.
  width + 1, height + 1, gc.bmp_array.flatten()

Discovered when running examples/demo/depth.py