[Win] Use custom user-agent for facebook.

Fixes facebook chat.

See #867

src/lib/other/useragentmanager.cpp

@@ -53,6 +53,13 @@ QString UserAgentManager::userAgentForUrl(const QUrl &url) const
 {
     const QString &host = url.host();
 
+#ifdef Q_OS_WIN
+    // Facebook chat is not working with default user-agent
+    if (host == QLatin1String("facebook.com")) {
+        return "Mozilla/5.0 (Windows XP) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.77 Safari/535.7";
+    }
+#endif
+
     if (m_usePerDomainUserAgent) {
         QHashIterator<QString, QString> i(m_userAgentsList);
         while (i.hasNext()) {