Change RenderFrame to use InterfaceRegistry et al.

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

Index: services/shell/public/cpp/lib/interface_registry.cc
diff --git a/services/shell/public/cpp/lib/interface_registry.cc b/services/shell/public/cpp/lib/interface_registry.cc
index a4657b24e8304fc825e1892fffb2367a7e224ec8..f1b9ca9e617c0816318f8b0fbcfa8fe8a26818a3 100644
--- a/services/shell/public/cpp/lib/interface_registry.cc
+++ b/services/shell/public/cpp/lib/interface_registry.cc
@@ -9,7 +9,7 @@
 namespace shell {
 
 InterfaceRegistry::InterfaceRegistry(Connection* connection)
-    : binding_(this), connection_(connection) {}
+    : binding_(this), connection_(connection), weak_factory_(this) {}
 InterfaceRegistry::~InterfaceRegistry() {}
 
 void InterfaceRegistry::Bind(
@@ -18,6 +18,10 @@ void InterfaceRegistry::Bind(
   binding_.Bind(std::move(local_interfaces_request));
 }
 
+base::WeakPtr<InterfaceRegistry> InterfaceRegistry::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
 void InterfaceRegistry::RemoveInterface(const std::string& name) {
   auto it = name_to_binder_.find(name);
   if (it != name_to_binder_.end())