message: [tpu:profiler] Remove unused fields in ProfileResponse.
diff: @@ -40,7 +40,7 @@ message ProfileToolData {
  }
  message ProfileResponse {
  - uint64 xprof_response_size = 1; // Placeholder: return something meaningful.
  + reserved 1; // was uint64 placeholder for returning something meaningful.
  // Graphs of programs executed on TPUs during the profiling period.
  repeated GraphDef computation_graph = 2;
  