Remove untrusted scripting support.

ppapi/shared_impl/ppp_instance_combined.cc

 // Copyright (c) 2011 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.
 
 #include "ppapi/shared_impl/ppp_instance_combined.h"
 
 namespace ppapi {
 
 PPP_Instance_Combined::PPP_Instance_Combined(
     const PPP_Instance_0_5& instance_if)
-    : PPP_Instance_0_5(instance_if),
-      GetInstanceObject_0_4(NULL) {
-}
-
-PPP_Instance_Combined::PPP_Instance_Combined(
-    const PPP_Instance_0_4& instance_if)
-    : PPP_Instance_0_5(),  // Zero-initialize.
-      GetInstanceObject_0_4(instance_if.GetInstanceObject) {
-  DidCreate = instance_if.DidCreate;
-  DidDestroy = instance_if.DidDestroy;
-  DidChangeView = instance_if.DidChangeView;
-  DidChangeFocus = instance_if.DidChangeFocus;
-  HandleInputEvent = instance_if.HandleInputEvent;
-  HandleDocumentLoad = instance_if.HandleDocumentLoad;
+    : PPP_Instance_0_5(instance_if) {
 }
 
 }  // namespace ppapi