Regenerate all stuff.

grpc/prpc/e2etest/helloworld_test.pb_test.go

Index: grpc/prpc/e2etest/helloworld_test.pb_test.go
diff --git a/grpc/prpc/e2etest/helloworld_test.pb_test.go b/grpc/prpc/e2etest/helloworld_test.pb_test.go
index 594311fa0277e47f91c571b47a6707658f912bb8..9527bf88fd09541b0bc6becdddebb9eb765d831b 100644
--- a/grpc/prpc/e2etest/helloworld_test.pb_test.go
+++ b/grpc/prpc/e2etest/helloworld_test.pb_test.go
@@ -1,6 +1,5 @@
-// Code generated by protoc-gen-go.
+// Code generated by protoc-gen-go. DO NOT EDIT.
 // source: github.com/luci/luci-go/grpc/prpc/e2etest/helloworld_test.proto
-// DO NOT EDIT!
 
 /*
 Package e2etest is a generated protocol buffer package.
@@ -169,7 +168,7 @@ func init() {
 
 var fileDescriptor0 = []byte{
 	// 174 bytes of a gzipped FileDescriptorProto
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+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0xb2, 0x4f, 0xcf, 0x2c, 0xc9,
 	0x28, 0x4d, 0xd2, 0x4b, 0xce, 0xcf, 0xd5, 0xcf, 0x29, 0x4d, 0xce, 0x04, 0x13, 0xba, 0xe9, 0xf9,
 	0xfa, 0xe9, 0x45, 0x05, 0xc9, 0xfa, 0x05, 0x20, 0x22, 0xd5, 0x28, 0xb5, 0x24, 0xb5, 0xb8, 0x44,
 	0x3f, 0x23, 0x35, 0x27, 0x27, 0xbf, 0x3c, 0xbf, 0x28, 0x27, 0x25, 0x1e, 0xc4, 0xd7, 0x2b, 0x28,