Simplify the API to get icon/description for objects.

Get rid of the service for now, it's not necessary
until we allow activities to extend the
mime type -> generic type mapping (post 1.0)

lib/sugar/Makefile.am

@@ -1,4 +1,4 @@
-SUBDIRS = activity bundle clipboard graphics objects presence datastore
+SUBDIRS = activity bundle clipboard graphics presence datastore
 
 sugardir = $(pythondir)/sugar
 sugar_PYTHON =		\

lib/sugar/graphics/objectchooser.py

@@ -148,10 +148,7 @@ class CollapsedEntry(CanvasRoundBox):
 
         mime_type = self.jobject.metadata['mime_type']
         if not self._icon_name and mime_type:
-            type = objecttype.get_registry().get_type_for_mime(mime_type)
-            if type:
-                self._icon_name = type.icon
-
+            self._icon_name = mime.get_mime_icon(mime_type)
         if not self._icon_name:
             self._icon_name = 'image-missing'