Modifies WindowProxy::setSecurityToken so that the frame's SecurityOrigin is taken into account whe…

Source/bindings/core/v8/WindowProxy.cpp

Index: Source/bindings/core/v8/WindowProxy.cpp
diff --git a/Source/bindings/core/v8/WindowProxy.cpp b/Source/bindings/core/v8/WindowProxy.cpp
index 0feb32db4bbeed456e71777b4a2346a9e745af64..a6cec28c0ba6bd4a3615bf8fb3c065289dcd5937 100644
--- a/Source/bindings/core/v8/WindowProxy.cpp
+++ b/Source/bindings/core/v8/WindowProxy.cpp
@@ -454,8 +454,16 @@ void WindowProxy::setSecurityToken(SecurityOrigin* origin)
         return;
     }
 
-    if (m_world->isPrivateScriptIsolatedWorld())
+    if (m_world->isPrivateScriptIsolatedWorld()) {
         token = "private-script://" + token;
+    } else if (m_world->isIsolatedWorld()) {
+        String frameSecurityToken = m_frame->securityContext()->securityOrigin()->toString();
+        if (frameSecurityToken.isEmpty() || frameSecurityToken == "null") {
+            context->UseDefaultSecurityToken();
+            return;
+        }
+        token = frameSecurityToken + token;
+    }
 
     CString utf8Token = token.utf8();
     // NOTE: V8 does identity comparison in fast path, must use a symbol