Make mojo_system static and mojo_system_impl a component, never use both

content/app/mojo/mojo_init.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/app/mojo/mojo_init.h"
 
 #include "base/logging.h"
 #include "mojo/embedder/embedder.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/service_manager/service_manager.h"
 
 namespace content {
 
 namespace {
 
 mojo::Environment* environment = NULL;
 
 }  // namespace
 
 void InitializeMojo() {
   DCHECK(!environment);
   environment = new mojo::Environment;
-  mojo::embedder::Init();
   mojo::ServiceManager::GetInstance();
 }
 
 void ShutdownMojo() {
   delete environment;
   environment = NULL;
 }
 
 }  // namespace content