Fix clang warning for 'using namespace std' in a header file: PowerGadgetLib.h

Fix clang warning for 'using namespace std' in a header file: PowerGadgetLib.h

Removed the 'using namespace std' directive from the header with using qualified
name for string as std::string.

TBR=brettw@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287758

[vivekg, 2014-08-06 04:41:01]

Fixed the warning reported here https://codereview.chromium.org/172183002/#msg19

[Nico, 2014-08-06 04:50:31]

lgtm, thanks

Looks like there's no upstream repo, weird.

[vivekg, 2014-08-06 04:54:14]

On 2014/08/06 04:50:31, Nico (very away) wrote:
> lgtm, thanks
> 
> Looks like there's no upstream repo, weird.

yeah. So I wonder whether this should really belong to third_party? 

Also I think we need OWNER's review for this third_party change.

[Nico, 2014-08-06 04:57:28]

On 2014/08/06 04:54:14, vivekg_ wrote:
> On 2014/08/06 04:50:31, Nico (very away) wrote:
> > lgtm, thanks
> > 
> > Looks like there's no upstream repo, weird.
> 
> yeah. So I wonder whether this should really belong to third_party? 
> 
> Also I think we need OWNER's review for this third_party change.

No:

$ cat ~/src/chrome/src/third_party/OWNERS 
# Owner approval for 3rd party is only required for
# adding new libraries. Be sure to follow the instructions for adding
# new third party libraries.
# http://www.chromium.org/developers/adding-3rd-party-libraries
#
# For changes to existing code simply TBR= one of people below.

[vivekg, 2014-08-06 05:00:26]

The CQ bit was checked by vivekg@chromium.org

[commit-bot: I haz the power, 2014-08-06 05:01:12]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vivek.vg@samsung.com/441083003/1

[commit-bot: I haz the power, 2014-08-06 11:19:59]

Change committed as 287758