Mercurial: Use explicit namespace in cpp files

Change-Id: Ic6aaa88dfdc33966e0e8007a9420461811ae48c2
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

src/plugins/mercurial/srcdestdialog.cpp

@@ -37,7 +37,9 @@
 #include <QUrl>
 
 using namespace VcsBase;
-using namespace Mercurial::Internal;
+
+namespace Mercurial {
+namespace Internal  {
 
 SrcDestDialog::SrcDestDialog(Direction dir, QWidget *parent) :
     QDialog(parent),
@@ -118,3 +120,6 @@ QUrl SrcDestDialog::getRepoUrl() const
         url = settings.value(QLatin1String("paths/default")).toUrl();
     return url;
 }
+
+} // namespace Internal
+} // namespace Mercurial