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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.cc
ElectronBrowserContext* browser_context,
                                      bool is_guest) {
  browser_context_ = browser_context;
  ontents->SetDelegate(this);
#if BUILDFLAG(ENABLE_PRINTING)
  PrintPreviewMessageHandler::CreateForWebContents(ontents);
  PrintViewManagerElectron::CreateForWebContents(ontents);
  printing::CreateCompositeClientIfNeeded(ontents,
                                          browser_context->GetUserAgent());
#endif
#if BUILDFLAG(ENABLE_PDF_VIEWER)
  pdf::PDFWebContentsHelper::CreateForWebContentsWithClient(
      ontents, std::make_unique<ElectronPDFWebContentsHelperClient>());
#endif
  
  auto* web_preferences = WebContentsPreferences::From(ontents);
  offscreen_ =
      web_preferences && web_preferences->IsEnabled(options::kOffscreen);
  
  inspectable_ontents_ = std::make_unique<InspectableWebContents>(
      ontents, browser_context->prefs(), is_guest);
  inspectable_ontents_->SetDelegate(this);
}
WebContents::~WebContents() {