Make window.screen property non replaceable

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index e21dde42bad0d5c76827adbe32bfa4ee358764dd..37b78e627289e9398481ac61ee434517fea4a0b6 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -82,6 +82,7 @@
 #include "core/frame/DOMWindow.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Screen.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLContentElement.h"
 #include "core/html/HTMLIFrameElement.h"
@@ -186,6 +187,7 @@ void Internals::resetToConsistentState(Page* page)
     page->setPageScaleFactor(1, IntPoint(0, 0));
     TextRun::setAllowsRoundingHacks(false);
     WebCore::overrideUserPreferredLanguages(Vector<AtomicString>());
+    Screen::clearOverrideScreenData();
     delete s_pagePopupDriver;
     s_pagePopupDriver = 0;
     page->chrome().client().resetPagePopupDriver();
@@ -2437,4 +2439,9 @@ String Internals::textSurroundingNode(Node* node, int x, int y, unsigned long ma
     return surroundingText.content();
 }
 
+void Internals::setOverrideScreenData(const Dictionary& overrideData)
+{
+    Screen::setOverrideScreenData(overrideData);
+}
+
 }