Rather than creating a new NetworkAccessManager when the page is reset,

reuse the existing manager and just clear its headers and cookies.

This avoids repeatedly setting up the SIGNAL/SLOT callback stuff which
is leading to unclosed pipes on Ubuntu, eventually causing "too many
open files" errors in large test suites.

src/NetworkAccessManager.cpp

@@ -23,3 +23,7 @@ void NetworkAccessManager::addHeader(QString key, QString value) {
   m_headers.insert(key, value);
 };
 
+void NetworkAccessManager::resetHeaders() {
+  m_headers.clear();
+};
+

src/NetworkAccessManager.h

@@ -9,10 +9,11 @@ class NetworkAccessManager : public QNetworkAccessManager {
   public:
     NetworkAccessManager(QObject *parent = 0);
     void addHeader(QString key, QString value);
+    void resetHeaders();
 
   protected:
     QNetworkReply* createRequest(QNetworkAccessManager::Operation op, const QNetworkRequest &req, QIODevice * outgoingData);
 
   private:
     QHash<QString, QString> m_headers;
-};
+};

src/Reset.cpp

@@ -8,8 +8,11 @@ Reset::Reset(WebPage *page, QStringList &arguments, QObject *parent) : Command(p
 
 void Reset::start() {
   page()->triggerAction(QWebPage::Stop);
-  page()->networkAccessManager()->setCookieJar(new NetworkCookieJar());
-  page()->setCustomNetworkAccessManager();
+
+  NetworkAccessManager* networkAccessManager = qobject_cast<NetworkAccessManager*>(page()->networkAccessManager());
+  networkAccessManager->setCookieJar(new NetworkCookieJar());
+  networkAccessManager->resetHeaders();
+
   page()->setUserAgent(NULL);
   page()->resetResponseHeaders();
   page()->resetConsoleMessages();