Change ppapi C++ comment style into C.

ppapi/c/dev/ppb_url_util_dev.h

Index: ppapi/c/dev/ppb_url_util_dev.h
diff --git a/ppapi/c/dev/ppb_url_util_dev.h b/ppapi/c/dev/ppb_url_util_dev.h
index 394ad87e5579737a4dea758d58948c7759fef7f1..9ea830509d38026178c172e079c85acbd6916386 100644
--- a/ppapi/c/dev/ppb_url_util_dev.h
+++ b/ppapi/c/dev/ppb_url_util_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_PPB_URL_UTIL_DEV_H_
 #define PPAPI_C_DEV_PPB_URL_UTIL_DEV_H_
 
@@ -111,4 +111,5 @@ struct PPB_UrlUtil_Dev {
   PP_Bool (*DocumentCanAccessDocument)(PP_Instance active, PP_Instance target);
 };
 
-#endif  // PPAPI_C_DEV_PPB_URL_UTIL_DEV_H_
+#endif  /* PPAPI_C_DEV_PPB_URL_UTIL_DEV_H_ */
+