Revert of Prepare WindowProxy for using v8::Context::NewRemoteContext().

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 9b60146f7a3e9a6585557d06abfb140fed4dd672..cbe01ec0bc20a6cf45f997a3e7d32e969c01b0f5 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptState.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptState.h
@@ -156,6 +156,9 @@
   }
   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();
@@ -181,6 +184,10 @@
   // 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