Debugger: Simplify GdbEngine::updateWatchData

The removed parts were only used with the non-Python engine.

Change-Id: Ia6858517b011c6f7ace8b2521beafdb4b03efc89
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/gdb/gdbengine.h

@@ -417,7 +417,6 @@ protected:
 
     void setLocals(const QList<GdbMi> &locals);
 
-    QSet<QByteArray> m_processedNames;
     struct TypeInfo
     {
         TypeInfo(uint s = 0) : size(s) {}