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

ppapi/native_client/tests/ppapi_geturl/url_load_request.cc

-// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Copyright (c) 2011 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 "native_client/tests/ppapi_geturl/url_load_request.h"
 
 #include <stdio.h>
 #include <string>
 #include <sstream>
 
 #include "native_client/src/include/portability.h"
@@ skipping 329 matching lines @@
 }
 
 void UrlLoadRequest::OpenFileBodyCallback(int32_t pp_error) {
   printf("--- UrlLoadRequest::OpenFileBodyCallback\n");
   if (pp_error != PP_OK) {
     ReportFailure("UrlLoadRequest::OpenFileBodyCallback: ", pp_error);
     return;
   }
   ReadFileBody();
 }