Some time in the past, --reset-results would create the necessary -expected.txt files for testharness.js tests. This is no longer the case, but it does still work for other tests.

Two tests to try it with:
editing/execCommand/insert-paragraph-into-table.html (testharness.js)
editing/execCommand/indent-div-inside-list.html (testRunner.dumpAsText())


Steps to repro:

```
rm editing/execCommand/insert-paragraph-into-table-expected.txt editing/execCommand/indent-div-inside-list-expected.txt
third_party/blink/tools/run_web_tests.py --target=Default --reset-results editing/execCommand/insert-paragraph-into-table.html editing/execCommand/indent-div-inside-list.html
```

The output has:
Writing new expected result "editing/execCommand/indent-div-inside-list-expected.txt"

But "editing/execCommand/insert-paragraph-into-table-expected.txt" is still not deleted.

robertma@, any idea what might cause this? I think someone has mentioned it to me before, and I noticed it myself today.