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

content/common/mojo/mojo_shell_connection_impl.cc

 // Copyright 2015 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/common/mojo/mojo_shell_connection_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 46 matching lines @@
   WaitForShell(std::move(handle));
 }
 
 MojoShellConnectionImpl::MojoShellConnectionImpl() : initialized_(false) {}
 MojoShellConnectionImpl::~MojoShellConnectionImpl() {
   STLDeleteElements(&listeners_);
 }
 
 void MojoShellConnectionImpl::WaitForShell(
     mojo::ScopedMessagePipeHandle handle) {
-  mojo::ShellClientRequest request;
+  mojo::shell::mojom::ShellClientRequest request;
   runner_connection_.reset(mojo::shell::RunnerConnection::ConnectToRunner(
       &request, std::move(handle)));
   shell_connection_.reset(new mojo::ShellConnection(this, std::move(request)));
   shell_connection_->WaitForInitialize();
 }
 
 void MojoShellConnectionImpl::Initialize(mojo::Shell* shell,
                                          const std::string& url,
                                          uint32_t id,
                                          uint32_t user_id) {
@@ skipping 36 matching lines @@
 // static
 void MojoShellConnection::Destroy() {
   // This joins the shell controller thread.
   delete Get();
   lazy_tls_ptr.Pointer()->Set(nullptr);
 }
 
 MojoShellConnection::~MojoShellConnection() {}
 
 }  // namespace content