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..d61718099b3864cca3bfba1e829882ea027621bc 100644
--- a/LayoutTests/fast/forms/page-popup/page-popup-adjust-rect.html
+++ b/LayoutTests/fast/forms/page-popup/page-popup-adjust-rect.html
@@ -27,14 +27,14 @@ function makeRect(x, y, width, height) {
 }
 
 function test() {
-    popupWindow.screen = {

[Inactive, 2014/04/18 21:08:40]

This test was added in https://bugs.webkit.org/show_bug.cgi?id=98499 for more
info. Looks like keishi is the author and tkent reviewed it.

The test overrides the screen property here for the popup window so that
screen.* have consistent values across machines / bots.

The idea is that this test should make sure that (quoted from original patch):
    1. Page popup should reposition itself so it won't get clipped by
screen(Win/Linux) or rootview(Mac) bounds.
    2. Page popup should resize itself when it doesn't fit.

-        width: 80,
-        height: 60,
-        availLeft: 0,
-        availTop: 0,
-        availWidth: 80,
-        availHeight: 60,
-    };
+    internals.setOverrideScreenData({
+        "width": 80,
+        "height": 60,
+        "availLeft": 0,
+        "availTop": 0,
+        "availWidth": 80,
+        "availHeight": 60,
+    });
 
     debug("Move anchor element along the vertical axis.");