TextEditor: Remove some *Widget::createEditor implementation

This removes the ones that were not to be used anymore.
The fallback in the base class is left in for now.

Change-Id: I5e7ab16497a83eff9b11deb9e1feb390757eac0e
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

src/plugins/cmakeprojectmanager/cmakeeditor.cpp

@@ -155,7 +155,6 @@ public:
 private:
     bool save(const QString &fileName = QString());
     Link findLinkAt(const QTextCursor &cursor, bool resolveTarget = true, bool inNextSplit = false);
-    BaseTextEditor *createEditor();
     void contextMenuEvent(QContextMenuEvent *e);
 };
 
@@ -164,11 +163,6 @@ CMakeEditorWidget::CMakeEditorWidget()
     setCodeFoldingSupported(true);
 }
 
-BaseTextEditor *CMakeEditorWidget::createEditor()
-{
-    QTC_ASSERT("should not happen anymore" && false, return 0);
-}
-
 void CMakeEditorWidget::contextMenuEvent(QContextMenuEvent *e)
 {
     showDefaultContextMenu(e, Constants::M_CONTEXT);