impl/memory: Disallow empty namespace.

filter/dscache/globalconfig.go

Index: filter/dscache/globalconfig.go
diff --git a/filter/dscache/globalconfig.go b/filter/dscache/globalconfig.go
index d3fa620a09d9a8cbc68765f145ab1da6032db024..f116805fb0dbdbb35201854c25b23a441a91953f 100644
--- a/filter/dscache/globalconfig.go
+++ b/filter/dscache/globalconfig.go
@@ -9,7 +9,6 @@ import (
 	"time"
 
 	"github.com/luci/gae/service/datastore"
-	"github.com/luci/gae/service/info"
 	"github.com/luci/gae/service/memcache"
 	"github.com/luci/luci-go/common/clock"
 	"golang.org/x/net/context"
@@ -74,10 +73,6 @@ func IsGloballyEnabled(c context.Context) bool {
 	}
 
 	// always go to the default namespace
-	c, err := info.Get(c).Namespace("")
-	if err != nil {
-		return true
-	}
 	cfg := &GlobalConfig{Enable: true}
 	if err := datastore.Get(c).Get(cfg); err != nil && err != datastore.ErrNoSuchEntity {
 		return true
@@ -92,11 +87,6 @@ func IsGloballyEnabled(c context.Context) bool {
 // It's meant to be called from admin handlers on your app to turn dscache
 // functionality on or off in emergencies.
 func SetGlobalEnable(c context.Context, memcacheEnabled bool) error {
-	// always go to the default namespace
-	c, err := info.Get(c).Namespace("")
-	if err != nil {
-		return err
-	}
 	return datastore.Get(c).RunInTransaction(func(c context.Context) error {
 		ds := datastore.Get(c)
 		cfg := &GlobalConfig{Enable: true}