Revert of Revert of Reland factor out window proxy management portions of ScriptController.

Source/bindings/core/v8/NPV8Object.cpp

Index: Source/bindings/core/v8/NPV8Object.cpp
diff --git a/Source/bindings/core/v8/NPV8Object.cpp b/Source/bindings/core/v8/NPV8Object.cpp
index 22f5931b11972f514a52372b77c585747a34c360..6db91ed61db76b81029da21c1b54e55dcfe49624 100644
--- a/Source/bindings/core/v8/NPV8Object.cpp
+++ b/Source/bindings/core/v8/NPV8Object.cpp
@@ -40,6 +40,7 @@
 #include "bindings/core/v8/npruntime_priv.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/LocalFrame.h"
+#include "platform/ScriptForbiddenScope.h"
 #include "platform/UserGestureIndicator.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/StringExtras.h"
@@ -342,6 +343,9 @@ bool _NPN_Evaluate(NPP npp, NPObject* npObject, NPString* npScript, NPVariant* r
 bool _NPN_EvaluateHelper(NPP npp, bool popupsAllowed, NPObject* npObject, NPString* npScript, NPVariant* result)
 {
     VOID_TO_NPVARIANT(*result);
+    if (ScriptForbiddenScope::isScriptForbidden())
+        return false;
+
     if (!npObject)
         return false;