Rename String.prototype.contains to 'includes'.

Rename String.prototype.contains to 'includes'.

Per TC39 Nov 2014 decison.

R=arv@chromium.org,yangguo@chromium.org
LOG=Y

Committed: https://chromium.googlesource.com/v8/v8/+/b5379216e23ff0ec734e70361dd07057c2421c96

Committed: https://chromium.googlesource.com/v8/v8/+/df376f2d7523d51a2fa78da3c95b08cb9f59dbf7

[Dmitry Lomov (no reviews), 2014-11-19 23:42:48]

PTAL

[arv (Not doing code reviews), 2014-11-19 23:57:39]

LGTM

Making things work on the real web is hard.

[Dmitry Lomov (no reviews), 2014-11-20 00:03:22]

The CQ bit was checked by dslomov@chromium.org

[commit-bot: I haz the power, 2014-11-20 00:04:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/742963002/1

[commit-bot: I haz the power, 2014-11-20 00:32:07]

Committed patchset #1 (id:1)

[Michael Achenbach, 2014-11-20 09:03:04]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/745543002/ by machenbach@chromium.org.

The reason for reverting is: Breaks test262-es6:
http://build.chromium.org/p/client.v8/builders/V8%20Linux/builds/1289.

[Dmitry Lomov (no reviews), 2014-11-20 18:47:35]

The CQ bit was checked by dslomov@chromium.org

[commit-bot: I haz the power, 2014-11-20 18:48:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/742963002/20001

[commit-bot: I haz the power, 2014-11-20 19:19:43]

Committed patchset #2 (id:20001)