Initialize mojo once in non-SFI NaCl.

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 d234a2d8e0c2d952b66ec51f9e33f9eef5ccf6da..b90f14ae80123e7535a58695ddf8e1f52b94a18b 100644
--- a/ppapi/nacl_irt/plugin_startup.cc
+++ b/ppapi/nacl_irt/plugin_startup.cc
@@ -12,7 +12,6 @@
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "ipc/ipc_channel_handle.h"
-#include "mojo/edk/embedder/embedder.h"
 #include "ppapi/nacl_irt/manifest_service.h"
 #include "ppapi/shared_impl/ppb_audio_shared.h"
 
@@ -70,9 +69,6 @@ void StartUpPlugin() {
   DCHECK(!g_shutdown_event);
   DCHECK(!g_io_thread);
 
-  // The Mojo EDK must be initialized before using IPC.
-  mojo::edk::Init();
-
   g_shutdown_event =
       new base::WaitableEvent(base::WaitableEvent::ResetPolicy::MANUAL,
                               base::WaitableEvent::InitialState::NOT_SIGNALED);