ScriptState::contextIsEmpty shouldn't return true for a context whose global object is detached

Source/bindings/core/v8/ScriptValue.cpp

Index: Source/bindings/core/v8/ScriptValue.cpp
diff --git a/Source/bindings/core/v8/ScriptValue.cpp b/Source/bindings/core/v8/ScriptValue.cpp
index 7167aebbbfe5790394453ff708878ec69cc5bdab..5b7a362ce41c97e9952fceecdb756f13e0f14e18 100644
--- a/Source/bindings/core/v8/ScriptValue.cpp
+++ b/Source/bindings/core/v8/ScriptValue.cpp
@@ -76,7 +76,7 @@ bool ScriptValue::toString(String& result) const
 
 PassRefPtr<JSONValue> ScriptValue::toJSONValue(ScriptState* scriptState) const
 {
-    ASSERT(!scriptState->contextIsEmpty());
+    ASSERT(!scriptState->contextIsValid());
     ScriptState::Scope scope(scriptState);
     return v8ToJSONValue(scriptState->isolate(), v8Value(), JSONValue::maxDepth);
 }