message: [XLA:Python] Add `profiler_session` dep to `xla_extension` BUILD rule.
  changed the `profiler_service_impl` BUILD rule to only depend on
  `profiler_session_headers`. Add the definitions back to
  `xla_extension` to avoid "symbol not found" errors.
diff: @@ -372,6 +372,7 @@ pybind_extension(
  # not require Tensorflow.
  "//tensorflow/core:lib_internal_impl", # buildcleaner: keep
  "//tensorflow/core/profiler/lib:profiler_backends",
  + "//tensorflow/core/profiler/lib:profiler_session",
  "//tensorflow/core/profiler/lib:traceme",
  "//tensorflow/core/profiler/rpc:profiler_server",
  "//tensorflow/stream_executor:device_memory_allocator",
  