[NaCl SDK] Consistent use of copyright header.

native_client_sdk/src/libraries/nacl_io_test/kernel_object_test.cc

-/* Copyright (c) 2012 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.
- */
+// Copyright (c) 2012 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 <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <sys/stat.h>
 
 #include <map>
 #include <string>
 
 #include "nacl_io/kernel_handle.h"
@@ skipping 167 matching lines @@
   EXPECT_EQ(3, raw_handle->RefCount());
 
   handle.reset();
   EXPECT_EQ(2, raw_handle->RefCount());
 
   proxy->AcquireHandle(5, &handle);
   EXPECT_EQ(3, raw_handle->RefCount());
   EXPECT_EQ(raw_handle, handle.get());
 }