Change ppapi C++ comment style into C.

ppapi/c/dev/ppp_selection_dev.h

Index: ppapi/c/dev/ppp_selection_dev.h
diff --git a/ppapi/c/dev/ppp_selection_dev.h b/ppapi/c/dev/ppp_selection_dev.h
index d2f3f1a8f1dc629abeb1a8603aae7e8b3cf80298..dfbed35dabb14272d53af8c970ad6c561cf8c2ed 100644
--- a/ppapi/c/dev/ppp_selection_dev.h
+++ b/ppapi/c/dev/ppp_selection_dev.h
@@ -1,7 +1,7 @@
-// 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_PPP_SELECTION_DEV_H_
 #define PPAPI_C_DEV_PPP_SELECTION_DEV_H_
 
@@ -21,4 +21,5 @@ struct PPP_Selection_Dev {
                                    PP_Bool html);
 };
 
-#endif  // PPAPI_C_DEV_PPP_SELECTION_DEV_H_
+#endif  /* PPAPI_C_DEV_PPP_SELECTION_DEV_H_ */
+