Convert media_unittests to run exclusively on Swarming

Convert media_unittests to run exclusively on Swarming

13 configs already ran on Swarming
16 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.fyi.json: CrWinAsan tester
- chromium.fyi.json: CrWinAsan(dll) tester
- chromium.fyi.json: Linux Trusty
- chromium.fyi.json: Linux Trusty (dbg)
- chromium.linux.json: Cast Linux
- chromium.memory.fyi.json: Linux ChromeOS MSan Tests
- chromium.memory.fyi.json: Linux MSan Tests
- chromium.memory.fyi.json: Linux TSan Tests
- chromium.memory.json: Linux ASan LSan Tests (1)
- chromium.memory.json: Linux Chromium OS ASan LSan Tests (1)
- chromium.memory.json: Mac ASan 64 Tests (1)
- chromium.webkit.json: Linux ChromiumOS Tests (1)
- chromium.webkit.json: Linux ChromiumOS Tests (dbg)(1)

Ran:
  ./manage.py --convert media_unittests

R=dpranke@chromium.org
BUG=98637
Committed: https://crrev.com/35eb3a38aa21071f984f0b93f7e69bcd15dede43
Cr-Commit-Position: refs/heads/master@{#336235}

[Dirk Pranke, 2015-06-25 18:47:12]

lgtm

[M-A Ruel, 2015-06-25 18:47:33]

The CQ bit was checked by maruel@chromium.org

[commit-bot: I haz the power, 2015-06-25 18:49:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1210173002/1

[commit-bot: I haz the power, 2015-06-25 19:54:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-25 19:55:04]

Patchset 1 (id:??) landed as
https://crrev.com/35eb3a38aa21071f984f0b93f7e69bcd15dede43
Cr-Commit-Position: refs/heads/master@{#336235}