Move content's shell connections to the IO thread

services/shell/public/cpp/lib/connector_impl.h

 // Copyright 2016 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.
 
 #ifndef SERVICES_SHELL_PUBLIC_CPP_LIB_CONNECTOR_IMPL_H_
 #define SERVICES_SHELL_PUBLIC_CPP_LIB_CONNECTOR_IMPL_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 10 matching lines @@
   ~ConnectorImpl() override;
 
  private:
   void OnConnectionError();
 
   // Connector:
   std::unique_ptr<Connection> Connect(const std::string& name) override;
   std::unique_ptr<Connection> Connect(ConnectParams* params) override;
   std::unique_ptr<Connector> Clone() override;
 
+  bool BindIfNecessary();
+
   mojom::ConnectorPtrInfo unbound_state_;
   mojom::ConnectorPtr connector_;
 
-  std::unique_ptr<base::ThreadChecker> thread_checker_;
+  base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectorImpl);
 };
 
 }  // namespace shell
 
 #endif  // SERVICES_SHELL_PUBLIC_CPP_LIB_CONNECTOR_IMPL_H_