all: change module to google.golang.org/protobuf

Temporarily remove go.mod, since we can't generate an accurate one until
the corresponding v1 change is submitted.

Change-Id: I1e1ad97f2b455e33f61ffaeb8676289795e47e72
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/177000
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
diff --git a/encoding/textpb/decode_test.go b/encoding/textpb/decode_test.go
index dd166cd..d1e7b14 100644
--- a/encoding/textpb/decode_test.go
+++ b/encoding/textpb/decode_test.go
@@ -9,16 +9,16 @@
 	"testing"
 
 	protoV1 "github.com/golang/protobuf/proto"
-	"github.com/golang/protobuf/v2/encoding/textpb"
-	"github.com/golang/protobuf/v2/internal/errors"
-	pimpl "github.com/golang/protobuf/v2/internal/impl"
-	"github.com/golang/protobuf/v2/internal/scalar"
-	"github.com/golang/protobuf/v2/proto"
-	preg "github.com/golang/protobuf/v2/reflect/protoregistry"
+	"google.golang.org/protobuf/encoding/textpb"
+	"google.golang.org/protobuf/internal/errors"
+	pimpl "google.golang.org/protobuf/internal/impl"
+	"google.golang.org/protobuf/internal/scalar"
+	"google.golang.org/protobuf/proto"
+	preg "google.golang.org/protobuf/reflect/protoregistry"
 
-	"github.com/golang/protobuf/v2/encoding/testprotos/pb2"
-	"github.com/golang/protobuf/v2/encoding/testprotos/pb3"
-	knownpb "github.com/golang/protobuf/v2/types/known"
+	"google.golang.org/protobuf/encoding/testprotos/pb2"
+	"google.golang.org/protobuf/encoding/testprotos/pb3"
+	knownpb "google.golang.org/protobuf/types/known"
 )
 
 func TestUnmarshal(t *testing.T) {