Move asserts for tracking global object detachment to WindowProxy.

third_party/WebKit/Source/bindings/core/v8/ScriptState.h

Index: third_party/WebKit/Source/bindings/core/v8/ScriptState.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptState.h b/third_party/WebKit/Source/bindings/core/v8/ScriptState.h
index cbe01ec0bc20a6cf45f997a3e7d32e969c01b0f5..9b60146f7a3e9a6585557d06abfb140fed4dd672 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptState.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptState.h
@@ -156,9 +156,6 @@ class CORE_EXPORT ScriptState : public RefCounted<ScriptState> {
   }
   void detachGlobalObject();
   void clearContext() { return m_context.clear(); }
-#if DCHECK_IS_ON()
-  bool isGlobalObjectDetached() const { return m_globalObjectDetached; }
-#endif
 
   V8PerContextData* perContextData() const { return m_perContextData.get(); }
   void disposePerContextData();
@@ -184,10 +181,6 @@ class CORE_EXPORT ScriptState : public RefCounted<ScriptState> {
   // disposePerContextData() once you no longer need V8PerContextData.
   // Otherwise, the v8::Context will leak.
   std::unique_ptr<V8PerContextData> m_perContextData;
-
-#if DCHECK_IS_ON()
-  bool m_globalObjectDetached = false;
-#endif
 };
 
 // ScriptStateProtectingContext keeps the context associated with the