Vcs: Collapse VcsSubmitEditorFactory hierarchy

Same pattern as for VcsSubmitFactory.

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

src/plugins/mercurial/mercurialcommitwidget.cpp

@@ -112,9 +112,8 @@ void MercurialSubmitHighlighter::highlightBlock(const QString &text)
 }
 
 
-MercurialCommitWidget::MercurialCommitWidget(QWidget *parent) :
-        VcsBase::SubmitEditorWidget(parent),
-        mercurialCommitPanel(new QWidget)
+MercurialCommitWidget::MercurialCommitWidget()
+    : mercurialCommitPanel(new QWidget)
 {
     mercurialCommitPanelUi.setupUi(mercurialCommitPanel);
     insertTopWidget(mercurialCommitPanel);