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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
return inspectable_web_contents_.get();
  }
  NativeWindow* owner_window() const { return owner_window_.get(); }
  bool is_html_fullscreen() const { return html_fullscreen_; }
  void set_fullscreen_frame(content::RenderFrameHost* rfh) {
    fullscreen_frame_ = rfh;
  }
  
  void Message(bool internal,
               const std::string& channel,
               blink::CloneableMessage arguments,
               content::RenderFrameHost* render_frame_host);
  void Invoke(bool internal,
              const std::string& channel,
              blink::CloneableMessage arguments,
              electron::mojom::ElectronBrowser::InvokeCallback callback,
              content::RenderFrameHost* render_frame_host);
  void OnFirstNonEmptyLayout(content::RenderFrameHost* render_frame_host);
  void ReceivePostMessage(const std::string& channel,
                          blink::TransferableMessage message,
                          content::RenderFrameHost* render_frame_host);
  void MessageSync(
      bool internal,
      const std::string& channel,
      blink::CloneableMessage arguments,
      electron::mojom::ElectronBrowser::MessageSyncCallback callback,
      content::RenderFrameHost* render_frame_host);
  void MessageTo(bool internal,