Revert of Eliminate the ChannelMojo channel for renderers

content/child/child_thread_impl.h

Index: content/child/child_thread_impl.h
diff --git a/content/child/child_thread_impl.h b/content/child/child_thread_impl.h
index 39658fab20a515222aadb984cf997f8ddd9df75a..20c03e0e42f3877ecb18656874b2a47a3ed7285b 100644
--- a/content/child/child_thread_impl.h
+++ b/content/child/child_thread_impl.h
@@ -20,7 +20,6 @@
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/public/child/child_thread.h"
-#include "ipc/ipc.mojom.h"
 #include "ipc/ipc_message.h"  // For IPC_MESSAGE_LOG_ENABLED.
 #include "ipc/ipc_platform_file.h"
 #include "ipc/message_router.h"
@@ -103,7 +102,6 @@
   shell::InterfaceProvider* GetRemoteInterfaces() override;
 
   // shell::ShellClient:
-  bool AcceptConnection(shell::Connection* connection) override;
   shell::InterfaceRegistry* GetInterfaceRegistryForConnection() override;
   shell::InterfaceProvider* GetInterfaceProviderForConnection() override;
 
@@ -254,11 +252,8 @@
 
   void EnsureConnected();
 
-  void BindBootstrapRequest(mojo::ScopedMessagePipeHandle handle);
-
   std::unique_ptr<mojo::edk::ScopedIPCSupport> mojo_ipc_support_;
   std::unique_ptr<MojoShellConnection> mojo_shell_connection_;
-  IPC::mojom::BootstrapPtr pending_bootstrap_;
   std::unique_ptr<shell::InterfaceRegistry> interface_registry_;
   std::unique_ptr<shell::InterfaceProvider> remote_interfaces_;