Fix some compiler warnings

- Remove deprecated Qt::AA_EnableHighDpiScaling and Qt::AA_UseHighDpiPixmaps
  from examples. High-DPI scaling is always enabled.
- Reorder initialization of members of QWebEngineDownloadRequestPrivate.
  Also remove m_ prefix from public members' name.
- Remove unused parameters from methods of DummyDelegate.
- Add missing overrides in auto tests.

Change-Id: I18d6973b8bee574b37b73fbaaa8d57002ac8ba2d
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
(cherry picked from commit 740b8c94f27930a33298c81c2284d1f0a9e2f11b)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 0 insertions, 1 deletions

diff --git a/examples/webenginewidgets/webui/main.cpp b/examples/webenginewidgets/webui/main.cpp
index 0f6a3e87e..92c1b8e7d 100644
--- a/examples/webenginewidgets/webui/main.cpp
+++ b/examples/webenginewidgets/webui/main.cpp
@@ -58,7 +58,6 @@
 int main(int argc, char *argv[])
 {
     QCoreApplication::setOrganizationName("QtExamples");
-    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 
     WebUiHandler::registerUrlScheme();