Update URLs and import paths to new GitHub home.
diff --git a/proto/extensions_test.go b/proto/extensions_test.go
index f8ed150..9c8a6bc 100644
--- a/proto/extensions_test.go
+++ b/proto/extensions_test.go
@@ -1,7 +1,7 @@
 // Go support for Protocol Buffers - Google's data interchange format
 //
 // Copyright 2014 The Go Authors.  All rights reserved.
-// http://code.google.com/p/goprotobuf/
+// https://github.com/golang/protobuf
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -35,7 +35,7 @@
 	"testing"
 
 	pb "./testdata"
-	"code.google.com/p/goprotobuf/proto"
+	"github.com/golang/protobuf/proto"
 )
 
 func TestGetExtensionsWithMissingExtensions(t *testing.T) {