Generalize InterfacePtrSet for [Associated]InterfacePtr.

mojo/services/tracing/tracing_app.cc

Index: mojo/services/tracing/tracing_app.cc
diff --git a/mojo/services/tracing/tracing_app.cc b/mojo/services/tracing/tracing_app.cc
index d921a6d97b9d00038f049795a527f16b3a0c45fc..c38bfad2a19b66f451a1ccfcbc87502235bb06b8 100644
--- a/mojo/services/tracing/tracing_app.cc
+++ b/mojo/services/tracing/tracing_app.cc
@@ -38,7 +38,7 @@ bool TracingApp::AcceptConnection(mojo::Connection* connection) {
         new TraceRecorderImpl(GetProxy(&recorder_ptr), sink_.get()));
     provider_ptr->StartTracing(tracing_categories_, std::move(recorder_ptr));
   }
-  provider_ptrs_.AddInterfacePtr(std::move(provider_ptr));
+  provider_ptrs_.AddPtr(std::move(provider_ptr));
   return true;
 }