Use ChannelMojo for NaCl IRT channels in non-sfi mode.

ppapi/nacl_irt/plugin_startup.cc

Index: ppapi/nacl_irt/plugin_startup.cc
diff --git a/ppapi/nacl_irt/plugin_startup.cc b/ppapi/nacl_irt/plugin_startup.cc
index 2b9270ef302544ba577420cea49dcf61c7ba286c..ce9067cf1d49b763e0611484c48d14c6d20dc897 100644
--- a/ppapi/nacl_irt/plugin_startup.cc
+++ b/ppapi/nacl_irt/plugin_startup.cc
@@ -28,8 +28,8 @@ base::Thread* g_io_thread = NULL;
 ManifestService* g_manifest_service = NULL;
 
 bool IsValidChannelHandle(IPC::ChannelHandle* handle) {
-  // ChannelMojo not yet supported.
-  return handle && handle->socket.fd != -1 && !handle->mojo_handle.is_valid();
+  return handle &&
+      (handle->socket.fd != -1 || handle->mojo_handle.is_valid());
 }
 
 // Creates the manifest service on IO thread so that its Listener's thread and