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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/ui/inspectable_web_contents.cc
policy {
          cookies_allowed: YES
          cookies_store: "user"
          setting:
            "It's not possible to disable this feature from settings."
        })");
  network::ResourceRequest resource_request;
  resource_request.url = gurl;
  resource_request.site_for_cookies = net::SiteForCookies::FromUrl(gurl);
  resource_request.headers.AddHeadersFromString(headers);
  auto* protocol_registry = ProtocolRegistry::FromBrowserContext(
      GetDevToolsWebContents()->GetBrowserContext());
  NetworkResourceLoader::URLLoaderFactoryHolder url_loader_factory;
  if (gurl.SchemeIsFile()) {
    mojo::PendingRemote<network::mojom::URLLoaderFactory> pending_remote =
        AsarURLLoaderFactory::Create();
    url_loader_factory = network::SharedURLLoaderFactory::Create(
        std::make_unique<network::WrapperPendingSharedURLLoaderFactory>(
            std::move(pending_remote)));
  } else if (protocol_registry->IsProtocolRegistered(gurl.scheme())) {
    auto& protocol_handler = protocol_registry->handlers().at(gurl.scheme());
    mojo::PendingRemote<network::mojom::URLLoaderFactory> pending_remote =
        ElectronURLLoaderFactory::Create(protocol_handler.first,
                                         protocol_handler.second);
    url_loader_factory = network::SharedURLLoaderFactory::Create(
        std::make_unique<network::WrapperPendingSharedURLLoaderFactory>(
            std::move(pending_remote)));
  } else {
    auto* partition = GetDevToolsWebContents()
                          ->GetBrowserContext()