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/glsleditor/glsleditor.cpp

@@ -125,8 +125,6 @@ public:
     IAssistInterface *createAssistInterface(AssistKind assistKind, AssistReason reason) const;
 
 private:
-    BaseTextEditor *createEditor();
-
     void updateDocumentNow();
     void setSelectedElements();
     QString wordUnderCursor() const;
@@ -210,11 +208,6 @@ QString GlslEditorWidget::wordUnderCursor() const
     return word;
 }
 
-BaseTextEditor *GlslEditorWidget::createEditor()
-{
-    QTC_ASSERT("should not happen anymore" && false, return 0);
-}
-
 void GlslEditorWidget::updateDocumentNow()
 {
     m_updateDocumentTimer.stop();