Use ChannelMojo from the browser to NaCl loader process.

ppapi/nacl_irt/irt_start.cc

Index: ppapi/nacl_irt/irt_start.cc
diff --git a/ppapi/nacl_irt/irt_start.cc b/ppapi/nacl_irt/irt_start.cc
index b0f09df701bb493bef0437d8703864e2637ce057..e5a62c5330d6cfc94239bbed6ed14ae6e0993c18 100644
--- a/ppapi/nacl_irt/irt_start.cc
+++ b/ppapi/nacl_irt/irt_start.cc
@@ -28,7 +28,7 @@ void nacl_irt_start(uint32_t* info) {
       NACL_CHROME_DESC_BASE,
       NACL_CHROME_DESC_BASE + 1,
       NACL_CHROME_DESC_BASE + 2);
-  ppapi::StartUpPlugin();
+  ppapi::StartUpPlugin(true);
 
   nacl_irt_enter_user_code(info, chrome_irt_query);
 }