Simplify IPC::SyncMessageSchema::WriteReplyParams() using variadic templates

ipc/ipc_message_utils.h

Index: ipc/ipc_message_utils.h
diff --git a/ipc/ipc_message_utils.h b/ipc/ipc_message_utils.h
index 597729705a952ca4c6ef5c3c6262c92036b77b52..1afb36ee94e06ab3c2c9e62b19f08c6a4dc4f9b0 100644
--- a/ipc/ipc_message_utils.h
+++ b/ipc/ipc_message_utils.h
@@ -906,33 +906,9 @@ class SyncMessageSchema {
     return ok;
   }
 
-  template<typename TA>
-  static void WriteReplyParams(Message* reply, TA a) {
-    ReplyParam p(a);
-    WriteParam(reply, p);
-  }
-
-  template<typename TA, typename TB>
-  static void WriteReplyParams(Message* reply, TA a, TB b) {
-    ReplyParam p(a, b);
-    WriteParam(reply, p);
-  }
-
-  template<typename TA, typename TB, typename TC>
-  static void WriteReplyParams(Message* reply, TA a, TB b, TC c) {
-    ReplyParam p(a, b, c);
-    WriteParam(reply, p);
-  }
-
-  template<typename TA, typename TB, typename TC, typename TD>
-  static void WriteReplyParams(Message* reply, TA a, TB b, TC c, TD d) {
-    ReplyParam p(a, b, c, d);
-    WriteParam(reply, p);
-  }
-
-  template<typename TA, typename TB, typename TC, typename TD, typename TE>
-  static void WriteReplyParams(Message* reply, TA a, TB b, TC c, TD d, TE e) {
-    ReplyParam p(a, b, c, d, e);
+  template<typename... T>

[Tom Sepez, 2015/03/25 17:11:58]

Nit: space before < (not your fault, but lets fix it).
Nit: generally we use Ts instead of T for variadic templates (as in "plural of
T"
Nit: prefer "args" to "a", again since it sounds plural.

+  static void WriteReplyParams(Message* reply, T... a) {
+    ReplyParam p(a...);
     WriteParam(reply, p);
   }
 };