Remove "all_webkit" target.

Remove "all_webkit" target.

Everybody should be building blink_tests right now. As it is today all_webkit is just an alias to blink_tests.

It was added by r233699 - https://codereview.chromium.org/59233012

Blink side - https://codereview.chromium.org/191973002

Nobody seems to be using it anymore.

BUG=None
TEST=None (no functional changes).
R=jochen@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260063

[jochen (gone - plz use gerrit), 2014-03-27 14:19:50]

lgtm

[jochen (gone - plz use gerrit), 2014-03-27 14:20:31]

please send a PSA to blink-dev@ in case somebody is still using it, and change
the CL description to indicate that the target is replaced by blink_tests

[tfarina, 2014-03-27 16:57:46]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2014-03-27 16:58:00]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tfarina@chromium.org/214703003/1

[commit-bot: I haz the power, 2014-03-27 18:03:12]

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

[commit-bot: I haz the power, 2014-03-27 18:03:12]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[tfarina, 2014-03-27 18:54:37]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2014-03-27 18:55:28]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tfarina@chromium.org/214703003/1

[commit-bot: I haz the power, 2014-03-27 23:54:50]

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

[commit-bot: I haz the power, 2014-03-27 23:54:51]

Retried try job too often on ios_dbg_simulator for step(s) crypto_unittests,
url_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=ios_dbg_si...

[tfarina, 2014-03-28 02:39:14]

Committed patchset #1 manually as r260063 (presubmit successful).