Debugger: Remove unneeded function from CdbOptions.

Change-Id: If9c6dd0f2fc53b7f5c7e5868bd57d01c9fc84d24
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/debugger/cdb/cdbengine.cpp

@@ -317,7 +317,7 @@ DebuggerEngine *createCdbEngine(const DebuggerStartParameters &sp, QString *erro
 {
     if (Utils::HostOsInfo::isWindowsHost()) {
         CdbOptionsPage *op = CdbOptionsPage::instance();
-        if (!op || !op->options()->isValid() || !validMode(sp.startMode)) {
+        if (!op || !validMode(sp.startMode)) {
             *errorMessage = QLatin1String("Internal error: Invalid start parameters passed for thee CDB engine.");
             return 0;
         }

src/plugins/debugger/cdb/cdboptions.h

@@ -46,8 +46,6 @@ public:
 
     void clear();
 
-    bool isValid() { return true; }
-
     void fromSettings(QSettings *s); // Writes parameters on first-time autodetect
     void toSettings(QSettings *s) const;