When launching PNaCl helper nexes, explicitly disable IRT loading.

chrome/renderer/pepper/ppb_nacl_private_impl.cc

Index: chrome/renderer/pepper/ppb_nacl_private_impl.cc
diff --git a/chrome/renderer/pepper/ppb_nacl_private_impl.cc b/chrome/renderer/pepper/ppb_nacl_private_impl.cc
index bb5abf6ee04332a94a9826a714f9ac6cfff66165..9fa4e88e3a816ed2a7073df2a94882fa7018cb2f 100644
--- a/chrome/renderer/pepper/ppb_nacl_private_impl.cc
+++ b/chrome/renderer/pepper/ppb_nacl_private_impl.cc
@@ -70,6 +70,7 @@ PP_NaClResult LaunchSelLdr(PP_Instance instance,
                            PP_Bool uses_ppapi,
                            PP_Bool enable_ppapi_dev,
                            int socket_count,
+                           PP_Bool uses_irt,
                            void* imc_handles) {
   std::vector<nacl::FileDescriptor> sockets;
   IPC::Sender* sender = content::RenderThread::Get();
@@ -103,7 +104,9 @@ PP_NaClResult LaunchSelLdr(PP_Instance instance,
           instance_info.url,
           routing_id,
           perm_bits,
-          socket_count, &sockets,
+          socket_count,
+          PP_ToBool(uses_irt),

[Mark Seaborn, 2013/01/04 00:05:41]

You don't need PP_ToBool() here, do you?  It's already a PP_Bool.

[jvoung (off chromium), 2013/01/04 17:09:23]

This is convert it from a PP_Bool to a "bool" (instead of the other way?)

+          &sockets,
           &instance_info.channel_handle,
           &instance_info.plugin_child_id))) {
     return PP_NACL_FAILED;