Update Native Client Authors to be Chromium Authors for the code moved from the

ppapi/native_client/src/trusted/plugin/string_encoding_test.cc

 /*
- * Copyright 2010 The Native Client Authors. All rights reserved.
+ * Copyright 2010 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can
  * be found in the LICENSE file.
  */
 
 #include <string.h>
 
 #include "native_client/src/shared/platform/nacl_check.h"
 #include "native_client/src/trusted/plugin/string_encoding.h"
 
 
@@ skipping 33 matching lines @@
   CHECK(!plugin::ByteStringFromUTF8(input, strlen(input),
                                     &output, &output_size));
   // Over long encoding
   // This is a non-canonical encoding for \x00
   input = "\xc0\x80";
   CHECK(!plugin::ByteStringFromUTF8(input, strlen(input),
                                     &output, &output_size));
 
   return 0;
 }