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/proto/decode_test.go b/proto/decode_test.go
index 4eb2598..c1810c5 100644
--- a/proto/decode_test.go
+++ b/proto/decode_test.go
@@ -10,16 +10,16 @@
 	"testing"
 
 	protoV1 "github.com/golang/protobuf/proto"
-	"github.com/golang/protobuf/v2/encoding/textpb"
-	"github.com/golang/protobuf/v2/internal/encoding/pack"
-	"github.com/golang/protobuf/v2/internal/errors"
-	"github.com/golang/protobuf/v2/internal/scalar"
-	"github.com/golang/protobuf/v2/proto"
-	pref "github.com/golang/protobuf/v2/reflect/protoreflect"
-	"github.com/golang/protobuf/v2/runtime/protolegacy"
+	"google.golang.org/protobuf/encoding/textpb"
+	"google.golang.org/protobuf/internal/encoding/pack"
+	"google.golang.org/protobuf/internal/errors"
+	"google.golang.org/protobuf/internal/scalar"
+	"google.golang.org/protobuf/proto"
+	pref "google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/runtime/protolegacy"
 
-	testpb "github.com/golang/protobuf/v2/internal/testprotos/test"
-	test3pb "github.com/golang/protobuf/v2/internal/testprotos/test3"
+	testpb "google.golang.org/protobuf/internal/testprotos/test"
+	test3pb "google.golang.org/protobuf/internal/testprotos/test3"
 )
 
 type testProto struct {