Revert of Make RenderProcessHost/RenderThread use MojoChildConnection/MojoShellConnection

services/shell/public/cpp/lib/interface_provider.cc

Index: services/shell/public/cpp/lib/interface_provider.cc
diff --git a/services/shell/public/cpp/lib/interface_provider.cc b/services/shell/public/cpp/lib/interface_provider.cc
index 7d7b950d71ab98f1c858003005dc2181246b21dc..268c49a46bcf3b03752294258f6a232649f45683 100644
--- a/services/shell/public/cpp/lib/interface_provider.cc
+++ b/services/shell/public/cpp/lib/interface_provider.cc
@@ -6,15 +6,12 @@
 
 namespace shell {
 
-InterfaceProvider::InterfaceProvider() : weak_factory_(this) {
-  pending_request_ = GetProxy(&interface_provider_);
-}
+InterfaceProvider::InterfaceProvider() : weak_factory_(this) {}
 InterfaceProvider::~InterfaceProvider() {}
 
 void InterfaceProvider::Bind(mojom::InterfaceProviderPtr interface_provider) {
-  DCHECK(pending_request_.is_pending());
-  mojo::FuseInterface(std::move(pending_request_),
-                      interface_provider.PassInterface());
+  DCHECK(!interface_provider_.is_bound());
+  interface_provider_ = std::move(interface_provider);
 }
 
 void InterfaceProvider::SetConnectionLostClosure(