Move openEditorAt from BaseTextEditorWidget to EditorManager

More sensible place, gotoLine is a method in IEditor anyhow.

Change-Id: I420a6bf17060c16e6f1a4f45e0bef89379fb6bf8
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/cppeditor/cppeditor.cpp

@@ -2002,10 +2002,10 @@ bool CPPEditorWidget::openCppEditorAt(const Link &link, bool inNextSplit)
         return true;
     }
 
-    return TextEditor::BaseTextEditorWidget::openEditorAt(link.targetFileName,
-                                                          link.targetLine,
-                                                          link.targetColumn,
-                                                          Constants::CPPEDITOR_ID);
+    return Core::EditorManager::openEditorAt(link.targetFileName,
+                                             link.targetLine,
+                                             link.targetColumn,
+                                             Constants::CPPEDITOR_ID);
 }
 
 void CPPEditorWidget::semanticRehighlight(bool force)