IOutputPane: Refactor zoom function into base class

Try to make zoom and font handling in the panes more
similar and put common stuff into IOutputPane.

Change-Id: I59c38c5eecbf67b7ca6c9d84a6f61b1292a787df
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/messageoutputwindow.h

@@ -46,7 +46,6 @@ public:
     ~MessageOutputWindow() override;
 
     QWidget *outputWidget(QWidget *parent) override;
-    QList<QWidget*> toolBarWidgets() const override;
 
     QString displayName() const override;
     int priorityInStatusBar() const override;
@@ -64,16 +63,8 @@ public:
     void goToPrev() override;
     bool canNavigate() const override;
 
-    void setFont(const QFont &font);
-    void setWheelZoomEnabled(bool enabled);
-
 private:
-    void storeSettings() const;
-    void loadSettings();
-
     OutputWindow *m_widget;
-    QToolButton *m_zoomInButton = nullptr;
-    QToolButton *m_zoomOutButton = nullptr;
 };
 
 } // namespace Internal