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

ppapi/native_client/src/shared/ppapi_proxy/command_buffer_nacl.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/src/shared/ppapi_proxy/command_buffer_nacl.h"
 
 #include <sys/mman.h>
 #include "gpu/command_buffer/common/logging.h"
 #include "native_client/src/shared/ppapi_proxy/plugin_globals.h"
 #include "native_client/src/shared/ppapi_proxy/utility.h"
 #include "ppapi/c/ppb_core.h"
@@ skipping 185 matching lines @@
 gpu::CommandBuffer::State CommandBufferNacl::PpapiToGpuState(
     PP_Graphics3DTrustedState s) {
   gpu::CommandBuffer::State state;
   state.num_entries = s.num_entries;
   state.get_offset  = s.get_offset;
   state.put_offset  = s.put_offset;
   state.token       = s.token;
   state.error       = static_cast<gpu::error::Error>(s.error);
   return state;
 }