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

ppapi/native_client/tests/ppapi_test_lib/get_browser_interface.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/platform/nacl_check.h"
 
 #include "ppapi/c/dev/ppb_context_3d_dev.h"
 #include "ppapi/c/dev/ppb_cursor_control_dev.h"
 #include "ppapi/c/dev/ppb_font_dev.h"
 #include "ppapi/c/dev/ppb_graphics_3d_dev.h"
 #include "ppapi/c/dev/ppb_memory_dev.h"
@@ skipping 158 matching lines @@
 const PPB_Testing_Dev* PPBTestingDev() {
   return  reinterpret_cast<const PPB_Testing_Dev*>(
       GetBrowserInterface(PPB_TESTING_DEV_INTERFACE));
 }
 
 const PPB_Widget_Dev* PPBWidgetDev() {
   return  reinterpret_cast<const PPB_Widget_Dev*>(
       GetBrowserInterface(PPB_WIDGET_DEV_INTERFACE));
 }