QmlJsEditor: Hide plugin class definition in .cpp

Change-Id: I7d6325059aedd92b34072de1fbb05bc72fc95efd
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/qmljseditor/qmljssemanticinfoupdater.cpp

@@ -95,7 +95,7 @@ QmlJSTools::SemanticInfo SemanticInfoUpdater::makeNewSemanticInfo(const QmlJS::D
     semanticInfo.setRootScopeChain(QSharedPointer<const ScopeChain>(scopeChain));
 
     if (doc->language() == Dialect::Json) {
-        JsonSchema *schema = QmlJSEditorPlugin::jsonManager()->schemaForFile(
+        JsonSchema *schema = jsonManager()->schemaForFile(
             doc->fileName().toString());
         if (schema) {
             JsonCheck jsonChecker(doc);