Roll leveldb to r71

Roll leveldb to r71.

The only change applicable to chromium is a fix for a bug 
that causes corruption. The corruption manifests as a missing 
sst file that renders the database unopenable.

BUG=168649
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=175442

[dgrogan, 2013-01-07 22:20:06]

Josh or Alec, could you review this?

[jsbell, 2013-01-07 22:22:57]

On 2013/01/07 22:20:06, dgrogan wrote:
> Josh or Alec, could you review this?

Don't we usually include notes in either the README file or commit message about
the included changes?

[dgrogan, 2013-01-07 22:23:38]

On 2013/01/07 22:22:57, jsbell wrote:
> On 2013/01/07 22:20:06, dgrogan wrote:
> > Josh or Alec, could you review this?
> 
> Don't we usually include notes in either the README file or commit message
about
> the included changes?

Yes. Coming up.

[jsbell, 2013-01-07 22:24:07]

But the patch LGTM

[dgrogan, 2013-01-07 22:25:06]

now includes README.chromium

[dgrogan, 2013-01-07 22:25:43]

On 2013/01/07 22:25:06, dgrogan wrote:
> now includes README.chromium

Oh, I misread your message.  More things coming up.

[commit-bot: I haz the power, 2013-01-07 22:32:54]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dgrogan@chromium.org/11775018/6001

[commit-bot: I haz the power, 2013-01-08 01:16:58]

Change committed as 175442