Fix some sandbox memory leaks

Fix some sandbox memory leaks

The memory allocated by AllocAndCopyName was not being freed under certain conditions.

Credit to yunli.sharing@gmail.com for spotting these.

BUG=414039
Committed: https://crrev.com/43aa4044b86faeab356265252b0fe9cac36e6568
Cr-Commit-Position: refs/heads/master@{#311079}

[Will Harris, 2015-01-12 06:54:16]

wfh@chromium.org changed reviewers:
+ jschuh@chromium.org

[Will Harris, 2015-01-12 06:54:57]

PTAL

[Will Harris, 2015-01-12 07:31:58]

wfh@chromium.org changed reviewers:
+ cpu@chromium.org
- jschuh@chromium.org

[Will Harris, 2015-01-12 07:32:26]

actually ignoring git cl owners, best for cpu@ to review as he changed this same
code recently.  Thanks!

[jschuh, 2015-01-12 19:00:17]

Drive-by lgtm since this is a straightforward fix. cpu@, I hope you don't mind
me grabbing an easy one. :)

[jschuh, 2015-01-12 19:00:23]

The CQ bit was checked by jschuh@chromium.org

[commit-bot: I haz the power, 2015-01-12 19:01:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/849553002/1

[commit-bot: I haz the power, 2015-01-12 19:13:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-12 19:14:18]

Patchset 1 (id:??) landed as
https://crrev.com/43aa4044b86faeab356265252b0fe9cac36e6568
Cr-Commit-Position: refs/heads/master@{#311079}