Mercurial: Use explicit namespace in cpp files

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

src/plugins/mercurial/revertdialog.cpp

@@ -30,7 +30,8 @@
 
 #include "revertdialog.h"
 
-using namespace Mercurial::Internal;
+namespace Mercurial {
+namespace Internal  {
 
 RevertDialog::RevertDialog(QWidget *parent) :
     QDialog(parent),
@@ -48,3 +49,6 @@ QString RevertDialog::revision() const
 {
     return m_ui->revisionLineEdit->text();
 }
+
+} // namespace Internal
+} // namespace Mercurial