Remove unused member variable

Change-Id: I11397ac0e95ef8d754464dfb781667d247d9a83a
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/qmljseditor/qmljscompletionassist.h

@@ -114,7 +114,6 @@ private:
     QScopedPointer<const QmlJSCompletionAssistInterface> m_interface;
     QList<TextEditor::BasicProposalItem *> m_completions;
     TextEditor::SnippetAssistCollector m_snippetCollector;
-    const TextEditor::IAssistProvider *m_provider;
 };