[cleanup] remove --harmony-classes flag from mjsunit/harmony/new-target

[cleanup] remove --harmony-classes flag from mjsunit/harmony/new-target

Unknown flag warning is adding unnecessary noise to terminal during
test runs

BUG=
LOG=N
R=adamk@chromium.org

Committed: https://crrev.com/124d2011ea1dfc3d21e9d7f639cdd69ccc0fbeb2
Cr-Commit-Position: refs/heads/master@{#29691}

[adamk, 2015-07-15 20:23:19]

adamk@chromium.org changed reviewers:
+ adamk@chromium.org

[adamk, 2015-07-15 20:23:19]

lgtm

[caitp (gmail), 2015-07-15 20:36:44]

On 2015/07/15 20:23:19, adamk wrote:
> lgtm

thanks

[caitp (gmail), 2015-07-15 20:37:10]

The CQ bit was checked by caitpotter88@gmail.com

[commit-bot: I haz the power, 2015-07-15 20:37:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1236993003/1

[commit-bot: I haz the power, 2015-07-15 20:41:56]

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

[commit-bot: I haz the power, 2015-07-15 20:41:57]

Try jobs failed on following builders:
  v8_linux64_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_rel/builds/7769)

(exceeded global retry quota)

[adamk, 2015-07-15 22:13:25]

The CQ bit was checked by adamk@chromium.org

[commit-bot: I haz the power, 2015-07-15 22:13:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1236993003/1

[commit-bot: I haz the power, 2015-07-15 22:16:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-15 22:16:50]

Patchset 1 (id:??) landed as
https://crrev.com/124d2011ea1dfc3d21e9d7f639cdd69ccc0fbeb2
Cr-Commit-Position: refs/heads/master@{#29691}