[NaCl SDK] Consistent use of copyright header.

native_client_sdk/src/libraries/nacl_io/kernel_proxy.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 "nacl_io/kernel_proxy.h"
 
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <string.h>
 #include <iterator>
 #include <string>
 
@@ skipping 620 matching lines @@
   // this is never executed from free() -- we can be reasonably sure this is
   // true, because malloc only makes anonymous mmap() requests, and should only
   // be munmapping those allocations. We never add to mmap_info_list_ for
   // anonymous maps, so the unmap_list should always be empty when called from
   // free().
   return 0;
 }
 
 }  // namespace nacl_io