<!--  As an open source project with a dedicated but small maintainer team, it can sometimes take a long time for issues to be addressed so please be patient and we will get back to you as soon as we can.
-->

### Preflight Checklist
<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->

* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.


### 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
const gin_helper::Dictionary& web_preferences);
  
  static gin::WrapperInfo kWrapperInfo;
  static v8::Local<v8::ObjectTemplate> FillObjectTemplate(
      v8::Isolate*,
      v8::Local<v8::ObjectTemplate>);
  const char* GetTypeName() override;
  void Destroy();
  base::WeakPtr<WebContents> GetWeakPtr() { return weak_factory_.GetWeakPtr(); }
  bool GetBackgroundThrottling() const;
  void SetBackgroundThrottling(bool allowed);
  int GetProcessID() const;
  base::ProcessId GetOSProcessID() const;
  Type GetType() const;
  bool Equal(const WebContents* web_contents) const;
  void LoadURL(const GURL& url, const gin_helper::Dictionary& options);
  void Reload();
  void ReloadIgnoringCache();
  void DownloadURL(const GURL& url);
  GURL GetURL() const;
  std::u16string GetTitle() const;
  bool IsLoading() const;
  bool IsLoadingMainFrame() const;
  bool IsWaitingForResponse() const;
  void Stop();
  bool CanGoBack() const;
  void GoBack();
  bool CanGoForward() const;
  void GoForward();
  bool CanGoToOffset(int offset) const;