/** @see AwContentsClient#getVisitedHistory */
 @Override
 public void getVisitedHistory(ValueCallback<String[]> callback) {
   TraceEvent.begin();
   if (mWebChromeClient != null) {
     if (TRACE) Log.d(TAG, "getVisitedHistory");
     mWebChromeClient.getVisitedHistory(callback);
   }
   TraceEvent.end();
 }
 @Override
 public void getVisitedHistory(ValueCallback<String[]> callback) {
   if (originalWebChromeClient != null) {
     originalWebChromeClient.getVisitedHistory(callback);
   }
 }
 @Override
 public void getVisitedHistory(ValueCallback<String[]> callback) {
   super.getVisitedHistory(callback);
 }