QmlJSEditor: Remove functions from widget that delegate to document

Instead access document directly. Needs to export document.

Change-Id: I8fa86832982d2793ea951e88a5b6e3925b7cd281
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>

src/plugins/qmljseditor/qmljseditordocument_p.h

@@ -38,9 +38,11 @@
 #include <QTimer>
 
 namespace QmlJSEditor {
-namespace Internal {
 
 class QmlJSEditorDocument;
+
+namespace Internal {
+
 class QmlOutlineModel;
 class SemanticHighlighter;
 class SemanticInfoUpdater;