Revert 167808 - Get rid of use of CreateStringValue in chromeos/ directory.

Revert 167808 - Get rid of use of CreateStringValue in chromeos/ directory.

Reverting because the patch makes clang build failing:
> chrome/browser/chromeos/cros/network_library.cc:380:26:error: C++98 requires an
> accessible copy constructor for class 'base::StringValue' when binding a
>  reference to a temporary; was private [-Werror,-Wbind-to-temporary-copy]
>    SetValueProperty(prop, base::StringValue(str));
etc.

BUG=160586
Review URL: https://chromiumcodereview.appspot.com/11363203

TBR=estade@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=167826

[Evan Stade, 2012-11-15 18:03:08]

thanks for reverting.