Remove test dependency on the protobuf library; it is unneeded. (The protobuf

library is still a transitive dependency, via transformer/request/request.pb.go
and vendor/github/ampproject/amphtml/validator/validator.pb.go.)

PiperOrigin-RevId: 245434613

Author: twifkak

transformer/internal/htmlnode/htmlnode_test.go

@@ -18,7 +18,6 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/golang/protobuf/proto"
 	"golang.org/x/net/html/atom"
 	"golang.org/x/net/html"
 )
@@ -43,6 +42,8 @@ const htmltext = `
 </html>
 `
 
+func stringPtr(v string) *string { return &v }
+
 // Tests a bunch of different methods on the test HTML.
 func TestHTMLNode(t *testing.T) {
 	doc, err := html.Parse(strings.NewReader(htmltext))
@@ -140,9 +141,9 @@ func TestGetAttributeValOrNil(t *testing.T) {
 		namespace string
 		expected  *string
 	}{
-		{Element("p", html.Attribute{Namespace: "foo", Key: "id", Val: "A"}), "foo", proto.String("A")},
+		{Element("p", html.Attribute{Namespace: "foo", Key: "id", Val: "A"}), "foo", stringPtr("A")},
 		{Element("p", html.Attribute{Namespace: "foo", Key: "id", Val: "A"}), "differentnamespace", nil},
-		{Element("p", html.Attribute{Key: "id", Val: "A"}), "", proto.String("A")},
+		{Element("p", html.Attribute{Key: "id", Val: "A"}), "", stringPtr("A")},
 		{Element("p"), "", nil},
 	}
 	for _, tc := range testCases {