message: [XLA] Remove a dead function and a stale todo.
diff: @@ -300,8 +300,6 @@ class Service : public ServiceInterface {
  Service(const ServiceOptions& options,
  std::unique_ptr<Backend> execute_backend);
  - static StatusOr<std::unique_ptr<Backend>> CreateComputeConstantBackend();
  -
  // Resolves the given argument handles in the allocation tracker and returns
  // the corresponding allocations for every replica. The function also verifies
  // that each allocation matches the execution platform and device ordinal of
  @@ -437,8 +435,6 @@ class Service : public ServiceInterface {
  CompilationCache compilation_cache_;
  // Backend to compile and execute computations on.
  - //
  - // TODO(b/28616830): Support multiple backends for execution.
  std::unique_ptr<Backend> execute_backend_;
  TF_DISALLOW_COPY_AND_ASSIGN(Service);
  