When launching PNaCl helper nexes, explicitly disable IRT loading.

chrome/common/nacl_types.h

 // Copyright (c) 2012 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 CHROME_COMMON_NACL_TYPES_H_
 #define CHROME_COMMON_NACL_TYPES_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 39 matching lines @@
   bool validation_cache_enabled;
   std::string validation_cache_key;
   // Chrome version string. Sending the version string over IPC avoids linkage
   // issues in cases where NaCl is not compiled into the main Chromium
   // executable or DLL.
   std::string version;
 
   bool enable_exception_handling;
   bool enable_debug_stub;
   bool enable_ipc_proxy;
+  bool uses_irt;
 };
 
 // Parameters sent to the browser process to have it launch a NaCl process.
 //
 // If you change this, you will also need to update the IPC serialization in
 // renderer_messages.h.
 struct NaClLaunchParams {
   NaClLaunchParams();
-  NaClLaunchParams(const std::string& u, int r, uint32 p);
+  NaClLaunchParams(const std::string& u, int r, uint32 p, bool uses_irt);
   NaClLaunchParams(const NaClLaunchParams& l);
   ~NaClLaunchParams();
 
   std::string manifest_url;
   int render_view_id;
   uint32 permission_bits;
+  bool uses_irt;
 };
 
 }  // namespace nacl
 
 #endif  // CHROME_COMMON_NACL_TYPES_H_