refactor 'ExtractHeader' to 'gophercloud' proper
diff --git a/rackspace/objectstorage/v1/cdncontainers/results.go b/rackspace/objectstorage/v1/cdncontainers/results.go
index 05367e2..a5097ca 100644
--- a/rackspace/objectstorage/v1/cdncontainers/results.go
+++ b/rackspace/objectstorage/v1/cdncontainers/results.go
@@ -1,20 +1,8 @@
 package cdncontainers
 
-import (
-	"net/http"
-
-	"github.com/rackspace/gophercloud"
-)
-
-type headerResult struct {
-	gophercloud.Result
-}
-
-func (hr headerResult) ExtractHeader() (http.Header, error) {
-	return hr.Header, hr.Err
-}
+import "github.com/rackspace/gophercloud"
 
 // EnableResult represents the result of a get operation.
 type EnableResult struct {
-	headerResult
+	gophercloud.HeaderResult
 }