Move dummy service implementations into their own package.

go/src/infra/gae/libs/gae/memory/globalinfo.go

Index: go/src/infra/gae/libs/gae/memory/globalinfo.go
diff --git a/go/src/infra/gae/libs/gae/memory/globalinfo.go b/go/src/infra/gae/libs/gae/memory/globalinfo.go
index 13199ff6ac22beb762f6e98c8f99a65c46bdde1a..75232d406b250d1a5c4fec97898abb3bb3c92d7b 100644
--- a/go/src/infra/gae/libs/gae/memory/globalinfo.go
+++ b/go/src/infra/gae/libs/gae/memory/globalinfo.go
@@ -8,6 +8,7 @@ import (
 	"golang.org/x/net/context"
 
 	"infra/gae/libs/gae"
+	"infra/gae/libs/gae/dummy"
 )
 
 type giContextKeyType int
@@ -22,7 +23,7 @@ func curGID(c context.Context) *globalInfoData {
 // by gae.GetGI(c)
 func useGI(c context.Context) context.Context {
 	return gae.SetGIFactory(c, func(ic context.Context) gae.GlobalInfo {
-		return &giImpl{gae.DummyGI(), curGID(ic), ic}
+		return &giImpl{dummy.GI(), curGID(ic), ic}
 	})
 }