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

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_audio.cc

-// Copyright (c) 2010 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/src/shared/ppapi_proxy/plugin_ppb_audio.h"
 
 #include <pthread.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/errno.h>
 #include <sys/mman.h>
@@ skipping 297 matching lines @@
       GetAs<ppapi_proxy::PluginAudio>(audio_resource);
   if (NULL == audio.get()) {
     // Ignore if no audio_resource -> audio_instance mapping exists,
     // the app may have shutdown audio before StreamCreated() invoked.
     rpc->result = NACL_SRPC_RESULT_OK;
     return;
   }
   audio->StreamCreated(sync_socket, shm, shm_size);
   rpc->result = NACL_SRPC_RESULT_OK;
 }