Remove unused bailout reasons.

Remove unused bailout reasons.

This also adds a script to the tools directory that allows to grep for
unused bailout reasons. For now the script needs to be run manually.

R=mvstanton@chromium.org

Committed: https://crrev.com/4b22d5eca21444b0f8567b117895b894448e1460
Cr-Commit-Position: refs/heads/master@{#29609}

[mvstanton, 2015-07-13 12:10:34]

Cool!
LGTM.

[Michael Starzinger, 2015-07-13 12:46:20]

The CQ bit was checked by mstarzinger@chromium.org

[Michael Starzinger, 2015-07-13 12:46:21]

The patchset sent to the CQ was uploaded after l-g-t-m from
mvstanton@chromium.org
Link to the patchset: https://codereview.chromium.org/1237623003/#ps20001
(title: "Respect cctest as well.")

[commit-bot: I haz the power, 2015-07-13 12:46:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1237623003/20001

[commit-bot: I haz the power, 2015-07-13 13:34:06]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-13 13:34:20]

Patchset 2 (id:??) landed as
https://crrev.com/4b22d5eca21444b0f8567b117895b894448e1460
Cr-Commit-Position: refs/heads/master@{#29609}