PPAPI: Make PPP_MessageHandler work in PNaCl

ppapi/api/ppb_messaging.idl

Index: ppapi/api/ppb_messaging.idl
diff --git a/ppapi/api/ppb_messaging.idl b/ppapi/api/ppb_messaging.idl
index 5100f5f5ed879ef6e764cbcaab7367276eb00750..8909ec546ebf61e7eb20a30a111b31dbeb6163ca 100644
--- a/ppapi/api/ppb_messaging.idl
+++ b/ppapi/api/ppb_messaging.idl
@@ -13,7 +13,7 @@
 
 label Chrome {
   M14 = 1.0,
-  [channel=dev] M37 = 1.1
+  [channel=dev] M39 = 1.2
 };
 
 /**
@@ -120,7 +120,7 @@ interface PPB_Messaging {
    * PPP_MessageHandler functions should be invoked.
    * @return PP_OK on success, or an error from pp_errors.h.
    */
-  [version=1.1]
+  [version=1.2]
   int32_t RegisterMessageHandler([in] PP_Instance instance,
                                  [inout] mem_t user_data,
                                  [in] PPP_MessageHandler handler,
@@ -140,7 +140,7 @@ interface PPB_Messaging {
    * @param[in] instance A <code>PP_Instance</code> identifying one instance
    * of a module.
    */
-  [version=1.1]
+  [version=1.2]
   void UnregisterMessageHandler([in] PP_Instance instance);
 };