Change ppapi C++ comment style into C.

ppapi/c/dev/ppb_file_chooser_dev.h

-// Copyright (c) 2010 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) 2010 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.
+ */
 #ifndef PPAPI_C_DEV_PPB_FILE_CHOOSER_DEV_H_
 #define PPAPI_C_DEV_PPB_FILE_CHOOSER_DEV_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_resource.h"
 
 struct PP_CompletionCallback;
 
@@ skipping 42 matching lines @@
   // After a successful call to Show, this method may be used to query the
   // chosen files.  It should be called in a loop until it returns 0.
   // Depending on the PP_ChooseFileMode requested when the FileChooser was
   // created, the file refs will either be readable or writable.  Their file
   // system type will be PP_FileSystemType_External.  If the user chose no
   // files or cancelled the dialog, then this method will simply return 0
   // the first time it is called.
   PP_Resource (*GetNextChosenFile)(PP_Resource chooser);
 };
 
-#endif  // PPAPI_C_DEV_PPB_FILE_CHOOSER_DEV_H_
+#endif  /* PPAPI_C_DEV_PPB_FILE_CHOOSER_DEV_H_ */
+