[Chaco] Remove deprecated DragZoom from Chaco tools API to eliminate irrelevant BaseZoomTool deprecation warning. DragZoom is still used in 4 Chaco examples
[Chaco] Remove deprecated DragZoom from Chaco tools API to eliminate irrelevant BaseZoomTool deprecation warning. DragZoom is still used in 4 Chaco examples

ContinuumIO/chaco,ContinuumIO/chaco,ContinuumIO/chaco,tommy-u/chaco,burnpanck/chaco,tommy-u/chaco,ContinuumIO/chaco,tommy-u/chaco,burnpanck/chaco,burnpanck/chaco