Remove various unused bits

src/sugar3/graphics/colorbutton.py

@@ -545,7 +545,6 @@ class ColorToolButton(Gtk.ToolItem):
     title = GObject.property(type=str, getter=get_title, setter=set_title)
 
     def do_draw(self, cr):
-        child = self.get_child()
         if self._palette and self._palette.is_up():
             allocation = self.get_allocation()
             # draw a black background, has been done by the engine before

src/sugar3/graphics/radiotoolbutton.py

@@ -131,7 +131,6 @@ class RadioToolButton(Gtk.RadioToolButton):
         type=object, setter=set_palette_invoker, getter=get_palette_invoker)
 
     def do_draw(self, cr):
-        child = self.get_child()
         if self.palette and self.palette.is_up():
             allocation = self.get_allocation()
             # draw a black background, has been done by the engine before

src/sugar3/graphics/toggletoolbutton.py

@@ -125,7 +125,6 @@ class ToggleToolButton(Gtk.ToggleToolButton):
                                    getter=get_accelerator)
 
     def do_draw(self, cr):
-        child = self.get_child()
         if self.palette and self.palette.is_up():
             allocation = self.get_allocation()
             # draw a black background, has been done by the engine before

src/sugar3/graphics/toolbutton.py

@@ -163,7 +163,6 @@ class ToolButton(Gtk.ToolButton):
         type=object, setter=set_palette_invoker, getter=get_palette_invoker)
 
     def do_draw(self, cr):
-        child = self.get_child()
         if self.palette and self.palette.is_up():
             allocation = self.get_allocation()
             # draw a black background, has been done by the engine before