Remove readline support from d8.

Remove readline support from d8.

Nobody seems to use it. A good alternative is rlwrap.

R=jochen@chromium.org

Committed: https://crrev.com/8e027195b48a7e510ba48d67af68b880ab9cd6a9
Cr-Commit-Position: refs/heads/master@{#29810}

[jochen (gone - plz use gerrit), 2015-07-23 12:56:52]

lgtm

[Yang, 2015-07-23 12:57:00]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-07-23 12:57:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1250223002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1250223002/1

[commit-bot: I haz the power, 2015-07-23 13:20:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-23 13:20:40]

Patchset 1 (id:??) landed as
https://crrev.com/8e027195b48a7e510ba48d67af68b880ab9cd6a9
Cr-Commit-Position: refs/heads/master@{#29810}

[adamk, 2015-07-23 19:05:50]

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

[adamk, 2015-07-23 19:05:51]

Please wait longer for responses before making changes like this in the future.