LogDog: Add collector service implementation.

client/cmd/logdog_butler/main.go

Index: client/cmd/logdog_butler/main.go
diff --git a/client/cmd/logdog_butler/main.go b/client/cmd/logdog_butler/main.go
index 605d68810444f1ed5818980478154537d47e428d..46999cf251de352a959851a4d6c2b3ffd9f5aad5 100644
--- a/client/cmd/logdog_butler/main.go
+++ b/client/cmd/logdog_butler/main.go
@@ -27,7 +27,6 @@ import (
 	"github.com/luci/luci-go/common/paniccatcher"
 	"github.com/maruel/subcommands"
 	"golang.org/x/net/context"
-	"google.golang.org/cloud"
 )
 
 const (
@@ -134,19 +133,6 @@ func (a *butlerApplication) authenticatedClient(ctx context.Context) (*http.Clie
 	return a.client, nil
 }
 
-func (a *butlerApplication) authenticatedContext(ctx context.Context, project string) (context.Context, error) {

[dnj (Google), 2016/01/21 04:36:24]

No longer needed w/ Pub/Sub changes.

-	if project == "" {
-		return nil, errors.New("must supply a project name")
-	}
-
-	client, err := a.authenticatedClient(ctx)
-	if err != nil {
-		return nil, err
-	}
-
-	return cloud.WithContext(ctx, project, client), nil
-}
-
 func (a *butlerApplication) configOutput() (output.Output, error) {
 	factory := a.outputConfig.getFactory()
 	if factory == nil {