[NaCl SDK] Consistent use of copyright header.

native_client_sdk/src/libraries/nacl_io/path.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/path.h"
 
 #include <stdio.h>
 #include <string.h>
 #include <string>
 
 namespace nacl_io {
 
 Path::Path() {}
 
@@ skipping 184 matching lines @@
   paths_ = p.paths_;
   return *this;
 }
 
 Path& Path::operator =(const std::string& p) {
   return Set(p);
 }
 
 }  // namespace nacl_io