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### Issue Details
Electron Version: All Version
Operating System: macOS 10.15.3
Last Known Working Electron version: Never

### Bug
The color picker in devtools does not work.
In devtools if you want to change the colors of the CSS code. When you click on a color a color picker is supposed to appear but it does not appear.

### Screenshots
<img width="1013" alt="Capture d’écran 2020-09-07 à 11 42 44" src="https://user-images.githubusercontent.com/70572698/92374841-988ea280-f100-11ea-96be-afc93f6dd645.png">

shell/browser/api/electron_api_web_contents.h
std::unique_ptr<FrameSubscriber> frame_subscriber_;
#if BUILDFLAG(ENABLE_ELECTRON_EXTENSIONS)
  std::unique_ptr<extensions::ScriptExecutor> script_executor_;
#endif
  
  WebContents* embedder_ = nullptr;
  
  bool attached_ = false;
  
  WebContentsZoomController* zoom_controller_ = nullptr;
  
  Type type_ = Type::kBrowserWindow;
  int32_t id_;
  
  uint32_t find_in_page_request_id_ = 0;
  
  bool background_throttling_ = true;
  
  bool enable_devtools_ = true;
  
  base::ObserverList<ExtendedWebContentsObserver> observers_;
  v8::Global<v8::Value> pending_child_web_preferences_;
  
  base::WeakPtr<NativeWindow> owner_window_;
  bool offscreen_ = false;
  
  bool html_fullscreen_ = false;
  
  bool native_fullscreen_ = false;