Extract a Connector interface from Shell that can be cloned & passed to other threads

mojo/shell/public/cpp/lib/connection_impl.h

 // 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.
 
 #ifndef MOJO_SHELL_PUBLIC_CPP_LIB_CONNECTION_IMPL_H_
 #define MOJO_SHELL_PUBLIC_CPP_LIB_CONNECTION_IMPL_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 18 matching lines @@
   // the string value "*" all interfaces may be exposed.
   ConnectionImpl(const std::string& connection_url,
                  const std::string& remote_url,
                  uint32_t remote_id,
                  uint32_t remote_user_id,
                  shell::mojom::InterfaceProviderPtr remote_interfaces,
                  shell::mojom::InterfaceProviderRequest local_interfaces,
                  const std::set<std::string>& allowed_interfaces);
   ~ConnectionImpl() override;
 
-  shell::mojom::Shell::ConnectCallback GetConnectCallback();
+  shell::mojom::Connector::ConnectCallback GetConnectCallback();
 
  private:
   // Connection:
   const std::string& GetConnectionURL() override;
   const std::string& GetRemoteApplicationURL() override;
   uint32_t GetRemoteUserID() const override;
   void SetRemoteInterfaceProviderConnectionErrorHandler(
       const Closure& handler) override;
   bool GetRemoteApplicationID(uint32_t* remote_id) const override;
   void AddRemoteIDCallback(const Closure& callback) override;
@@ skipping 20 matching lines @@
 
   base::WeakPtrFactory<ConnectionImpl> weak_factory_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(ConnectionImpl);
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_PUBLIC_CPP_LIB_CONNECTION_IMPL_H_