message: Remove stale TODOs in TFLite
  I believe the CopyFromBufferHandle is well exercised in existing tests
  (e.g. Flex delegate uses this all the time)
diff: @@ -277,7 +277,6 @@ class Subgraph {
  TF_LITE_ENSURE(&context_, t->delegate != nullptr);
  TF_LITE_ENSURE(&context_, t->buffer_handle != kTfLiteNullBufferHandle);
  TF_LITE_ENSURE(&context_, t->delegate->CopyFromBufferHandle != nullptr);
  - // TODO(b/120420546): we must add a test that exercise this code.
  TF_LITE_ENSURE_STATUS(t->delegate->CopyFromBufferHandle(
  &context_, t->delegate, t->buffer_handle, t));
  t->data_is_stale = false;
  