diff --git a/mediatranslation/apiv1beta1/doc.go b/mediatranslation/apiv1beta1/doc.go
index 24bb22908bcd..cd0a9f663002 100644
--- a/mediatranslation/apiv1beta1/doc.go
+++ b/mediatranslation/apiv1beta1/doc.go
@@ -96,8 +96,6 @@ package mediatranslation // import "cloud.google.com/go/mediatranslation/apiv1be
 
 import (
 	"context"
-	"fmt"
-	"net/http"
 	"os"
 	"runtime"
 	"strconv"
@@ -186,22 +184,3 @@ func versionGo() string {
 	}
 	return "UNKNOWN"
 }
-
-// maybeUnknownEnum wraps the given proto-JSON parsing error if it is the result
-// of receiving an unknown enum value.
-func maybeUnknownEnum(err error) error {
-	if strings.Contains(err.Error(), "invalid value for enum type") {
-		err = fmt.Errorf("received an unknown enum value; a later version of the library may support it: %w", err)
-	}
-	return err
-}
-
-// buildHeaders extracts metadata from the outgoing context, joins it with any other
-// given metadata, and converts them into a http.Header.
-func buildHeaders(ctx context.Context, mds ...metadata.MD) http.Header {
-	if cmd, ok := metadata.FromOutgoingContext(ctx); ok {
-		mds = append(mds, cmd)
-	}
-	md := metadata.Join(mds...)
-	return http.Header(md)
-}