xds: not use Immutable collections in method signature
xds: not use Immutable collections in method signature


grpc/grpc-java,grpc/grpc-java,dapengzhang0/grpc-java,stanley-cheung/grpc-java,stanley-cheung/grpc-java,dapengzhang0/grpc-java,stanley-cheung/grpc-java,grpc/grpc-java,ejona86/grpc-java,grpc/grpc-java,ejona86/grpc-java,dapengzhang0/grpc-java,ejona86/grpc-java,ejona86/grpc-java,dapengzhang0/grpc-java,stanley-cheung/grpc-java