Add libstdc++6-4.6-dbg to build deps.

Add libstdc++6-4.6-dbg to build deps.

This package is needed for LeakSanitizer.

BUG=293335
TBR=pschmidt@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=234153

[earthdok, 2013-11-09 15:55:44]

ptal

[pschmidt, 2013-11-09 16:09:53]

lgtm

[commit-bot: I haz the power, 2013-11-09 16:36:53]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a lowly provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[commit-bot: I haz the power, 2013-11-09 16:45:58]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/earthdok@chromium.org/67843002/1

[earthdok, 2013-11-09 16:46:04]

On 2013/11/09 16:09:53, pschmidt wrote:
> lgtm

You used the wrong account, so I'll commit with TBR.

[commit-bot: I haz the power, 2013-11-10 00:43:45]

Change committed as 234153