Convert installer_util_unittests to run exclusively on Swarming

0 configs already ran on Swarming
7 used to run locally and were converted:
- chromium.fyi.json: CrWinAsan tester
- chromium.fyi.json: CrWinAsan(dll) tester
- chromium.win.json: Vista Tests (1)
- chromium.win.json: Win 7 Tests x64 (1)
- chromium.win.json: Win7 Tests (1)
- chromium.win.json: Win7 Tests (dbg)(1)
- chromium.win.json: XP Tests (1)

Ran:
  ./manage.py --convert installer_util_unittests

R=thakis@chromium.org
BUG=98637

Review URL: https://codereview.chromium.org/1220833004

Cr-Commit-Position: refs/heads/master@{#338449}
5 files changed