Remove support for client side system proxy credentials

Author: TheOneRing

src/gui/CMakeLists.txt

@@ -17,7 +17,6 @@ set(client_UI_SRCS
     shareusergroupwidget.ui
     shareuserline.ui
     tlserrordialog.ui
-    proxyauthdialog.ui
     notificationwidget.ui
     logbrowser.ui
 )
@@ -62,8 +61,6 @@ set(client_SRCS
     thumbnailjob.cpp
     quotainfo.cpp
     accountstate.cpp
-    proxyauthhandler.cpp
-    proxyauthdialog.cpp
     tooltipupdater.cpp
     notificationwidget.cpp
     notificationconfirmjob.cpp

src/gui/accountmanager.cpp

@@ -17,7 +17,6 @@
 #include "common/asserts.h"
 #include "configfile.h"
 #include "creds/credentialmanager.h"
-#include "proxyauthhandler.h"
 #include <cookiejar.h>
 #include <creds/httpcredentialsgui.h>
 #include <theme.h>
@@ -393,8 +392,6 @@ void AccountManager::deleteAccount(AccountStatePtr account)
 AccountPtr AccountManager::createAccount(const QUuid &uuid)
 {
     AccountPtr acc = Account::create(uuid);
-    connect(acc.data(), &Account::proxyAuthenticationRequired,
-        ProxyAuthHandler::instance(), &ProxyAuthHandler::handleProxyAuthenticationRequired);
     return acc;
 }