Merged pull request aws#11: Remove expected attributes from deleting session.

Author: David Massad

lib/aws/session_store/dynamo_db/locking/base.rb

@@ -65,7 +65,7 @@ def handle_error(env = nil, &block)
 
     # @return [Hash] Options for deleting session.
     def delete_opts(sid)
-      merge_all(table_opts(sid), expected_attributes(sid))
+      table_opts(sid)
     end
 
     # @return [Hash] Options for updating item in Session table.
@@ -152,11 +152,6 @@ def data_unchanged?(env, session)
       env['rack.initial_data'] == session
     end
 
-    # Expected attributes
-    def expected_attributes(sid)
-      { :expected => {@config.table_key => {:value => {:s => sid}, :exists => false}} }
-    end
-
     # Attributes to be retrieved via client
     def attr_opts
       {:attributes_to_get => ["data"],