Migrate RenderFrameImpl to use BinderRegistry.

services/service_manager/public/cpp/lib/binder_registry.cc

Index: services/service_manager/public/cpp/lib/binder_registry.cc
diff --git a/services/service_manager/public/cpp/lib/binder_registry.cc b/services/service_manager/public/cpp/lib/binder_registry.cc
index 64cee5d3d01bb38555e837fbaa0490e32e508e09..fa2a21f60e8174d1a69a084c57df409018fb7986 100644
--- a/services/service_manager/public/cpp/lib/binder_registry.cc
+++ b/services/service_manager/public/cpp/lib/binder_registry.cc
@@ -8,7 +8,7 @@
 
 namespace service_manager {
 
-BinderRegistry::BinderRegistry() {}
+BinderRegistry::BinderRegistry() : weak_factory_(this) {}
 BinderRegistry::~BinderRegistry() {}
 
 void BinderRegistry::AddInterface(
@@ -44,6 +44,10 @@ void BinderRegistry::BindInterface(
   }
 }
 
+base::WeakPtr<BinderRegistry> BinderRegistry::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
 void BinderRegistry::SetInterfaceBinder(
     const std::string& interface_name,
     std::unique_ptr<InterfaceBinder> binder) {