Change ppapi C++ comment style into C.

ppapi/c/dev/ppb_transport_dev.h

Index: ppapi/c/dev/ppb_transport_dev.h
diff --git a/ppapi/c/dev/ppb_transport_dev.h b/ppapi/c/dev/ppb_transport_dev.h
index ee4fcaf6b315901c11f2dd18a1bebc7bcf261ab5..1e56ff472967460e0450831d32578a548595dfbf 100644
--- a/ppapi/c/dev/ppb_transport_dev.h
+++ b/ppapi/c/dev/ppb_transport_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_PPB_TRANSPORT_DEV_H_
 #define PPAPI_C_PPB_TRANSPORT_DEV_H_
 
@@ -67,4 +67,5 @@ struct PPB_Transport_Dev {
   int32_t (*Close)(PP_Resource transport);
 };
 
-#endif  // PPAPI_C_PPB_TRANSPORT_DEV_H_
+#endif  /* PPAPI_C_PPB_TRANSPORT_DEV_H_ */
+