Add out-of-line copy ctor to Maps::Iterator.

Add out-of-line copy ctor to Maps::Iterator.

Chrome's style checking plugin complains that this class needs an explicit
out-of-line copy constructor.

So far, the style plugin has not warned about nested classes because of a bug,
but we have fixed that bug and are now cleaning up all the cases where it warns.

Committed on behalf of Hans Wennborg (hans@chromium.org).

BUG=http://code.google.com/p/chromium/issues/detail?id=139346

Committed: https://code.google.com/p/seccompsandbox/source/detail?r=187

[hans, 2012-08-09 09:54:20]

mseaborn: can you take a look?

[hans, 2012-08-13 09:10:12]

Ping?

This is the last remaining piece of a relatively large clean-up, so would be
nice to get it landed.

[Mark Seaborn, 2012-08-13 16:15:45]

LGTM

[Mark Seaborn, 2012-08-14 00:49:08]

I've committed it for you.  Sorry for the delay!

Mark

[hans, 2012-08-14 07:27:22]

On 2012/08/14 00:49:08, Mark Seaborn wrote:
> I've committed it for you.  Sorry for the delay!

No problem, thanks for your help.