Make window.screen property non replaceable

LayoutTests/fast/forms/page-popup/page-popup-adjust-rect.html

Index: LayoutTests/fast/forms/page-popup/page-popup-adjust-rect.html
diff --git a/LayoutTests/fast/forms/page-popup/page-popup-adjust-rect.html b/LayoutTests/fast/forms/page-popup/page-popup-adjust-rect.html
index 2be796ec5886b262deb465a17518fc61bd775ec1..719c82a8fb0f4842ebb6e65c4c81079f5d17178c 100644
--- a/LayoutTests/fast/forms/page-popup/page-popup-adjust-rect.html
+++ b/LayoutTests/fast/forms/page-popup/page-popup-adjust-rect.html
@@ -26,15 +26,23 @@ function makeRect(x, y, width, height) {
     };
 }
 
+function overridePopupWindowScreenObject(w) {

[arv (Not doing code reviews), 2014/04/21 19:23:43]

You should also be able to do:

Object.defineProperty(window, 'screen', {
  width: {value: 80},
  height: {value: 60},
  availLeft: {value: 0},
  availTop: {value: 0},
  availWidth: {value: 80},
  availHeight: {value: 60},
});

[Inactive, 2014/04/21 19:51:53]

This did not seem to work so I used your other proposal.

+  delete w.screen['width']

[arv (Not doing code reviews), 2014/04/21 19:18:16]

delete w.screen.width;

+  w.screen.width = 80;
+  delete w.screen['height']
+  w.screen.height = 60;
+  delete w.screen['availLeft']
+  w.screen.availLeft = 0;
+  delete w.screen['availTop']
+  w.screen.availTop = 0;
+  delete w.screen['availWidth']
+  w.screen.availWidth = 80;
+  delete w.screen['availHeight']
+  w.screen.availHeight = 60;
+}
+
 function test() {
-    popupWindow.screen = {
-        width: 80,
-        height: 60,
-        availLeft: 0,
-        availTop: 0,
-        availWidth: 80,
-        availHeight: 60,
-    };
+    overridePopupWindowScreenObject(popupWindow);
 
     debug("Move anchor element along the vertical axis.");