TextEditor: Move CompletionAssistProvider construction

... to the editor factories and pass it to the document, not the widget.
Saves some code, puts fewer objects into the object pool.

Change-Id: Iaaf250af74dc4e0c62700873accbb40ba88b7d9e
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/cmakeprojectmanager/cmakeeditor.h

@@ -37,6 +37,7 @@ namespace CMakeProjectManager {
 namespace Internal {
 
 class CMakeEditorWidget;
+class CMakeSettingsPage;
 
 class CMakeEditor : public TextEditor::BaseTextEditor
 {
@@ -56,7 +57,7 @@ class CMakeEditorFactory : public TextEditor::TextEditorFactory
     Q_OBJECT
 
 public:
-    CMakeEditorFactory();
+    CMakeEditorFactory(CMakeSettingsPage *settingsPage);
 };
 
 } // namespace Internal