Add IPC Channel for new ManifestService.

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 a28673788229c67d399b840ffdacfbb1a1aec69d..a7c12e6c312a0f4b1348b0a47e6d3b7d752711cc 100644
--- a/ppapi/nacl_irt/irt_start.cc
+++ b/ppapi/nacl_irt/irt_start.cc
@@ -17,7 +17,9 @@ void nacl_irt_start(uint32_t* info) {
   // In SFI mode, the FDs of IPC channels are NACL_CHROME_DESC_BASE and its
   // successor, which is set in nacl_listener.cc.
   ppapi::SetIPCFileDescriptors(
-      NACL_CHROME_DESC_BASE, NACL_CHROME_DESC_BASE + 1);
+      NACL_CHROME_DESC_BASE,
+      NACL_CHROME_DESC_BASE + 1,
+      -1);  // Currently manifest service is disabled on NaCl in SFI mode.
   ppapi::StartUpPlugin();
 
   nacl_irt_enter_user_code(info, chrome_irt_query);