Revert of Make RenderProcessHost/RenderThread use MojoChildConnection/MojoShellConnection

content/common/mojo/mojo_shell_connection_impl.cc

Index: content/common/mojo/mojo_shell_connection_impl.cc
diff --git a/content/common/mojo/mojo_shell_connection_impl.cc b/content/common/mojo/mojo_shell_connection_impl.cc
index 6c5ef64a781e49dbfea18901945818a57531d393..93ba749fd178f6e4dffcdbda6db118f35ea842f5 100644
--- a/content/common/mojo/mojo_shell_connection_impl.cc
+++ b/content/common/mojo/mojo_shell_connection_impl.cc
@@ -100,32 +100,6 @@
   return accept;
 }
 
-shell::InterfaceRegistry*
-MojoShellConnectionImpl::GetInterfaceRegistryForConnection() {
-  // TODO(beng): This is really horrible since obviously subject to issues
-  // of ordering, but is no more horrible than this API is in general.
-  shell::InterfaceRegistry* registry = nullptr;
-  for (auto& client : embedded_shell_clients_) {
-    registry = client->GetInterfaceRegistryForConnection();
-    if (registry)
-      return registry;
-  }
-  return nullptr;
-}
-
-shell::InterfaceProvider*
-MojoShellConnectionImpl::GetInterfaceProviderForConnection() {
-  // TODO(beng): This is really horrible since obviously subject to issues
-  // of ordering, but is no more horrible than this API is in general.
-  shell::InterfaceProvider* provider = nullptr;
-  for (auto& client : embedded_shell_clients_) {
-    provider = client->GetInterfaceProviderForConnection();
-    if (provider)
-      return provider;
-  }
-  return nullptr;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // MojoShellConnectionImpl,
 //     shell::InterfaceFactory<shell::mojom::ShellClientFactory> implementation:
@@ -171,13 +145,7 @@
 
 void MojoShellConnectionImpl::AddEmbeddedShellClient(
     std::unique_ptr<shell::ShellClient> shell_client) {
-  embedded_shell_clients_.push_back(shell_client.get());
-  owned_shell_clients_.push_back(std::move(shell_client));
-}
-
-void MojoShellConnectionImpl::AddEmbeddedShellClient(
-    shell::ShellClient* shell_client) {
-  embedded_shell_clients_.push_back(shell_client);
+  embedded_shell_clients_.push_back(std::move(shell_client));
 }
 
 void MojoShellConnectionImpl::AddEmbeddedService(