[DevTools] Fix frontend host race and assert.

third_party/WebKit/Source/core/inspector/DevToolsHost.h

 /*
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 43 matching lines @@
     ~DevToolsHost();
     DECLARE_TRACE();
     void disconnectClient();
 
     float zoomFactor();
 
     void setInjectedScriptForOrigin(const String& origin, const String& script);
 
     void copyText(const String& text);
 
-    // Called from [Custom] implementations.
-    void showContextMenu(Event*, const Vector<ContextMenuItem>& items);
     void showContextMenu(LocalFrame* targetFrame, float x, float y, const Vector<ContextMenuItem>& items);
     void sendMessageToEmbedder(const String& message);
 
     String getSelectionBackgroundColor();
     String getSelectionForegroundColor();
 
     bool isUnderTest();
     bool isHostedMode();
 
     LocalFrame* frontendFrame() { return m_frontendFrame; }
 
     void clearMenuProvider() { m_menuProvider = nullptr; }
 
 private:
     DevToolsHost(InspectorFrontendClient*, LocalFrame* frontendFrame);
 
     InspectorFrontendClient* m_client;
     RawPtrWillBeMember<LocalFrame> m_frontendFrame;
     RawPtrWillBeMember<FrontendMenuProvider> m_menuProvider;
 };
 
 } // namespace blink
 
 #endif // DevToolsHost_h