Git: Use LayoutBuilder in Gerrit options page

Move towards using aspects and away from IOptionPage's QObject
base.

Change-Id: I07850a6b8e9fa7d2591efc6f76a23f249dfc164f
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/git/gerrit/gerritplugin.h

@@ -3,7 +3,7 @@
 
 #pragma once
 
-#include <utils/fileutils.h>
+#include <utils/filepath.h>
 
 #include <QObject>
 #include <QPointer>
@@ -25,6 +25,7 @@ class GerritChange;
 class GerritDialog;
 class GerritParameters;
 class GerritServer;
+class GerritOptionsPage;
 
 class GerritPlugin : public QObject
 {
@@ -60,6 +61,7 @@ private:
     Core::Command *m_gerritCommand = nullptr;
     Core::Command *m_pushToGerritCommand = nullptr;
     QString m_reviewers;
+    GerritOptionsPage *m_gerritOptionsPage = nullptr;
 };
 
 } // namespace Internal