Vcs: Collapse VcsSubmitEditorFactory hierarchy

Same pattern as for VcsSubmitFactory.

Change-Id: I7adb8868a83842c1b6c642db372a3624dd2e879e
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

src/plugins/mercurial/mercurialcommitwidget.h

@@ -43,9 +43,8 @@ namespace Internal {
 
 class MercurialCommitWidget : public VcsBase::SubmitEditorWidget
 {
-
 public:
-    explicit MercurialCommitWidget(QWidget *parent = 0);
+    MercurialCommitWidget();
 
     void setFields(const QString &repositoryRoot, const QString &branch,
                    const QString &userName, const QString &email);