Make the rest of the services have a similar raw/user interface structure.

impl/memory/taskqueue_data.go

Index: impl/memory/taskqueue_data.go
diff --git a/impl/memory/taskqueue_data.go b/impl/memory/taskqueue_data.go
index 906da1c8fe7a9a6ef687c9a384c01436106ffecd..9d7648fc28888cdb685434a5c2c1c63667790d84 100644
--- a/impl/memory/taskqueue_data.go
+++ b/impl/memory/taskqueue_data.go
@@ -124,13 +124,8 @@ var tqOkMethods = map[string]struct{}{
 	"DELETE": {},
 }
 
-func (t *taskQueueData) prepTask(c context.Context, ns string, task *tq.Task, queueName string) (*tq.Task, string, error) {
-	queueName, err := t.getQueueName(queueName)
-	if err != nil {
-		return nil, "", err
-	}
-
-	toSched := dupTask(task)
+func (t *taskQueueData) prepTask(c context.Context, ns string, task *tq.Task, queueName string) (*tq.Task, error) {
+	toSched := task.Duplicate()
 
 	if toSched.Path == "" {
 		toSched.Path = "/_ah/queue/" + queueName
@@ -147,7 +142,7 @@ func (t *taskQueueData) prepTask(c context.Context, ns string, task *tq.Task, qu
 		toSched.Method = "POST"
 	}
 	if _, ok := tqOkMethods[toSched.Method]; !ok {
-		return nil, "", fmt.Errorf("taskqueue: bad method %q", toSched.Method)
+		return nil, fmt.Errorf("taskqueue: bad method %q", toSched.Method)
 	}
 	if toSched.Method != "POST" && toSched.Method != "PUT" {
 		toSched.Payload = nil
@@ -167,11 +162,11 @@ func (t *taskQueueData) prepTask(c context.Context, ns string, task *tq.Task, qu
 		toSched.Name = mkName(c, "", t.named[queueName])
 	} else {
 		if !validTaskName.MatchString(toSched.Name) {
-			return nil, "", errors.New("INVALID_TASK_NAME")
+			return nil, errors.New("INVALID_TASK_NAME")
 		}
 	}
 
-	return toSched, queueName, nil
+	return toSched, nil
 }
 
 /////////////////////////////// txnTaskQueueData ///////////////////////////////
@@ -201,15 +196,6 @@ func (t *txnTaskQueueData) endTxn() {
 	atomic.StoreInt32(&t.closed, 1)
 }
 
-func (t *txnTaskQueueData) run(f func() error) error {
-	// Slightly different from the SDK... datastore and taskqueue each implement
-	// this here, where in the SDK only datastore.transaction.Call does.
-	if atomic.LoadInt32(&t.closed) == 1 {
-		return fmt.Errorf("taskqueue: transaction context has expired")
-	}
-	return f()
-}
-
 func (t *txnTaskQueueData) ResetTasks() {
 	t.Lock()
 	defer t.Unlock()
@@ -237,7 +223,7 @@ func (t *txnTaskQueueData) GetTransactionTasks() tq.AnonymousQueueData {
 	for k, vs := range t.anony {
 		ret[k] = make([]*tq.Task, len(vs))
 		for i, v := range vs {
-			tsk := dupTask(v)
+			tsk := v.Duplicate()
 			tsk.Name = ""
 			ret[k][i] = tsk
 		}