DevTools: Update dedicated workers thread name.

DevTools: Update dedicated workers thread name.

The name has recently changed, so DevTools code needs to reflect that.
Also enable workers in a test to ensure the names are consistent in
the future.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197242

[alph, 2015-06-16 14:12:17]

alph@chromium.org changed reviewers:
+ yurys@chromium.org

[yurys, 2015-06-16 14:20:45]

lgtm

[alph, 2015-06-16 15:32:17]

The CQ bit was checked by alph@chromium.org

[commit-bot: I haz the power, 2015-06-16 15:32:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1186883007/1

[commit-bot: I haz the power, 2015-06-16 17:44:21]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-16 17:44:23]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/66818)

[alph, 2015-06-17 06:28:06]

The CQ bit was checked by alph@chromium.org

[commit-bot: I haz the power, 2015-06-17 06:28:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1186883007/1

[commit-bot: I haz the power, 2015-06-17 07:30:51]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197242