[BalooRolesProvider] Remove unused roleForProperty method

src/kitemviews/private/kbaloorolesprovider.cpp

@@ -108,11 +108,6 @@ QHash<QByteArray, QVariant> KBalooRolesProvider::roleValues(const Baloo::File& f
     return values;
 }
 
-QByteArray KBalooRolesProvider::roleForProperty(const QString& property) const
-{
-    return m_roleForProperty.value(property);
-}
-
 KBalooRolesProvider::KBalooRolesProvider() :
     m_roles(),
     m_roleForProperty()

src/kitemviews/private/kbaloorolesprovider.h

@@ -42,8 +42,6 @@ public:
     QHash<QByteArray, QVariant> roleValues(const Baloo::File& file,
                                            const QSet<QByteArray>& roles) const;
 
-    QByteArray roleForProperty(const QString& property) const;
-
 protected:
     KBalooRolesProvider();