Don't pass --harmony-promises flag from gin to v8

Don't pass --harmony-promises flag from gin to v8

Promises are now enabled by default

BUG=none
R=adamk@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271410

[adamk, 2014-05-19 07:32:07]

lgtm

[jochen (gone - plz use gerrit), 2014-05-19 07:35:42]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2014-05-19 07:35:55]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jochen@chromium.org/290273004/1

[commit-bot: I haz the power, 2014-05-19 09:30:54]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)

[commit-bot: I haz the power, 2014-05-19 10:21:47]

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

[commit-bot: I haz the power, 2014-05-19 10:21:47]

Try jobs failed on following builders:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[jochen (gone - plz use gerrit), 2014-05-19 15:55:20]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2014-05-19 15:55:42]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jochen@chromium.org/290273004/1

[commit-bot: I haz the power, 2014-05-19 17:15:51]

Change committed as 271410