Remove quota argument from DemoStorage calls in preparation for ZODB 3.9.

doc/CHANGES.txt

@@ -219,6 +219,9 @@ Zope Changes
 
     Bugs Fixed
 
+      - Testing.ZopeTestCase: Remove quota argument from DemoStorage calls in
+        preparation for ZODB 3.9.
+
       - Ported c69896 to Five. This fix makes it possible to provide a
         template using Python, and not have it being set to `None` by
         the viewlet manager directive.

lib/python/Testing/ZopeTestCase/ZopeLite.py

@@ -229,9 +229,7 @@ from ZODB.DemoStorage import DemoStorage
 def sandbox(base=None):
     '''Returns a sandbox copy of the base ZODB.'''
     if base is None: base = Zope2.DB
-    base_storage = base._storage
-    quota = getattr(base_storage, '_quota', None)
-    storage = DemoStorage(base=base_storage, quota=quota)
+    storage = DemoStorage(base=base._storage)
     return ZODB.DB(storage)
 
 _write(' done (%.3fs)\n' % (time.time() - _start))