Convert chromeos_unittests to run exclusively on Swarming

0 configs already ran on Swarming
6 used to run locally and were converted:
- chromium.chromiumos.json: Linux ChromiumOS Ozone Tests (1)
- chromium.chromiumos.json: Linux ChromiumOS Tests (1)
- chromium.chromiumos.json: Linux ChromiumOS Tests (dbg)(1)
- chromium.memory.json: Linux Chromium OS ASan LSan Tests (1)
- chromium.webkit.json: Linux ChromiumOS Tests (1)
- chromium.webkit.json: Linux ChromiumOS Tests (dbg)(1)

Ran:
  ./manage.py --convert chromeos_unittests

BUG=98637

Review URL: https://codereview.chromium.org/1219123002

Cr-Commit-Position: refs/heads/master@{#336926}
5 files changed