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

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_pdf.h

-// 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.
 
 #ifndef NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_PPB_PDF_H_
 #define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_PPB_PDF_H_
 
 #include "native_client/src/include/nacl_macros.h"
 #include "ppapi/c/private/ppb_pdf.h"
 
 namespace ppapi_proxy {
 
 // Implements the untrusted side of the PPB_PDF private interface.
 class PluginPDF {
  public:
   PluginPDF();
   static const PPB_PDF* GetInterface();
 
  private:
   NACL_DISALLOW_COPY_AND_ASSIGN(PluginPDF);
 };
 
 }  // namespace ppapi_proxy
 
 #endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_PPB_PDF_H_