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

ppapi/native_client/tests/ppapi_example_events/ppapi_example_events.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.
 
 // C headers
 #include <cassert>
 #include <cstdio>
 
 // C++ headers
 #include <sstream>
 #include <string>
@@ skipping 189 matching lines @@
 
 // Implement the required pp::CreateModule function that creates our specific
 // kind of Module (in this case, EventModule).  This is part of the glue code
 // that makes our example accessible to ppapi.
 namespace pp {
   Module* CreateModule() {
     std::printf("Creating EventModule.\n");
     return new EventModule();
   }
 }