Change ppapi C++ comment style into C.

ppapi/c/ppb_url_request_info.h

Index: ppapi/c/ppb_url_request_info.h
diff --git a/ppapi/c/ppb_url_request_info.h b/ppapi/c/ppb_url_request_info.h
index 0282313c047672188689a90cf2bba17e20aaf0c6..de7e3da5fdde4a4e0947ec5dbd10306a68b7992b 100644
--- a/ppapi/c/ppb_url_request_info.h
+++ b/ppapi/c/ppb_url_request_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_REQUEST_INFO_H_
 #define PPAPI_C_PPB_URL_REQUEST_INFO_H_
 
@@ -84,4 +84,5 @@ struct PPB_URLRequestInfo {
                               PP_Time expected_last_modified_time);
 };
 
-#endif  // PPAPI_C_PPB_URL_REQUEST_INFO_H_
+#endif  /* PPAPI_C_PPB_URL_REQUEST_INFO_H_ */
+