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

ppapi/native_client/src/shared/ppapi_proxy/ppb_rpc_client.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.
 //
 // WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
 //
 // Automatically generated code.  See srpcgen.py
 //
 // NaCl Simple Remote Procedure Call interface abstractions.
 
 #include "untrusted/srpcgen/ppb_rpc.h"
@@ skipping 2696 matching lines @@
       channel,
       "PPB_Zoom_ZoomLimitsChanged:idd:",
       instance,
       minimum_factor,
       maximum_factor
   );
   return retval;
 }