Use the setting to determine whether showing context menu on mouse up.

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 841efd2396de7e5228d4b4ba9983e4debb4b1d07..519bab257a370acc8e2a2d846e5fa1387e5adf94 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -2827,15 +2827,15 @@ bool EventHandler::sendContextMenuEventForKey()
 
 bool EventHandler::sendContextMenuEventForGesture(const GestureEventWithHitTestResults& targetedEvent)
 {
-#if OS(WIN)
-    PlatformEvent::Type eventType = PlatformEvent::MouseReleased;
-#else
+    unsigned modifiers = targetedEvent.event().modifiers();
     PlatformEvent::Type eventType = PlatformEvent::MousePressed;
-#endif
+    if (m_frame->settings()->showContextMenuOnMouseUp())
+        eventType = PlatformEvent::MouseReleased;
+    else
+        modifiers |= PlatformEvent::RightButtonDown;
 
-    unsigned modifiers = targetedEvent.event().modifiers();
     PlatformMouseEvent mouseEvent(targetedEvent.event().position(), targetedEvent.event().globalPosition(), RightButton, eventType, 1,
-        static_cast<PlatformEvent::Modifiers>(modifiers | PlatformEvent::RightButtonDown),
+        static_cast<PlatformEvent::Modifiers>(modifiers),
         PlatformMouseEvent::FromTouch, WTF::currentTime());
     // To simulate right-click behavior, we send a right mouse down and then
     // context menu event.