Add a new switch: --allow-scripts-to-close-windows....

webkit/pending/DOMWindow.cpp

Index: webkit/pending/DOMWindow.cpp
===================================================================
--- webkit/pending/DOMWindow.cpp	(revision 2301)
+++ webkit/pending/DOMWindow.cpp	(working copy)
@@ -46,6 +46,7 @@
 #include "PlatformScreen.h"
 #include "PlatformString.h"
 #include "Screen.h"
+#include "Settings.h"
 #include <algorithm>
 #include <wtf/MathExtras.h>
 
@@ -345,7 +346,13 @@
     if (!m_frame)
         return;
 
-    if (m_frame->loader()->openedByDOM() || m_frame->loader()->getHistoryLength() <= 1)
+    Settings* settings = m_frame->settings();
+    bool allow_scripts_to_close_windows =
+        (settings && settings->allowScriptsToCloseWindows());
+
+    if (m_frame->loader()->openedByDOM()
+        || m_frame->loader()->getHistoryLength() <= 1
+        || allow_scripts_to_close_windows)
         m_frame->scheduleClose();
 }