gob: don't send type information about unexported fields.

A change a while back stop sending data for unexported fields
but due to an oversight the type info was being sent also. It's
inconsequential but wrong to do that.

R=rsc, rh
CC=golang-dev
https://golang.org/cl/4252058

src/pkg/gob/decode.go

@@ -13,9 +13,7 @@ import (
 	"math"
 	"os"
 	"reflect"
-	"unicode"
 	"unsafe"
-	"utf8"
 )
 
 var (
@@ -1073,12 +1071,6 @@ func (dec *Decoder) compileIgnoreSingle(remoteId typeId) (engine *decEngine, err
 	return
 }
 
-// isExported reports whether this is an exported - upper case - name.
-func isExported(name string) bool {
-	rune, _ := utf8.DecodeRuneInString(name)
-	return unicode.IsUpper(rune)
-}
-
 // compileDec compiles the decoder engine for a value.  If the value is not a struct,
 // it calls out to compileSingle.
 func (dec *Decoder) compileDec(remoteId typeId, ut *userTypeInfo) (engine *decEngine, err os.Error) {