Change ppapi C++ comment style into C.

ppapi/c/ppb_url_response_info.h

Index: ppapi/c/ppb_url_response_info.h
diff --git a/ppapi/c/ppb_url_response_info.h b/ppapi/c/ppb_url_response_info.h
index f64e59883ce08569ac2d7eeab30831d09bba196b..c0d8675207b820c6134ca3cabd62bbaa3e41d455 100644
--- a/ppapi/c/ppb_url_response_info.h
+++ b/ppapi/c/ppb_url_response_info.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_PPB_URL_RESPONSE_INFO_H_
 #define PPAPI_C_PPB_URL_RESPONSE_INFO_H_
 
@@ -42,4 +42,5 @@ struct PPB_URLResponseInfo {
   PP_Resource (*GetBodyAsFileRef)(PP_Resource response);
 };
 
-#endif  // PPAPI_C_PPB_URL_RESPONSE_INFO_H_
+#endif  /* PPAPI_C_PPB_URL_RESPONSE_INFO_H_ */
+