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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
->GetDefaultStoragePartition();
    url_loader_factory = partition->GetURLLoaderFactoryForBrowserProcess();
  }
  NetworkResourceLoader::Create(
      stream_id, this, resource_request, traffic_annotation,
      std::move(url_loader_factory), std::move(callback));
}
void InspectableWebContents::SetIsDocked(DispatchCallback callback,
                                         bool docked) {
  if (managed_devtools_web_contents_)
    view_->SetIsDocked(docked, activate_);
  if (!callback.is_null())
    std::move(callback).Run(nullptr);
}
void InspectableWebContents::OpenInNewTab(const std::string& url) {}
void InspectableWebContents::ShowItemInFolder(
    const std::string& file_system_path) {
  if (file_system_path.empty())
    return;
  base::FilePath path = base::FilePath::FromUTF8Unsafe(file_system_path);
  
  platform_util::OpenPath(path, platform_util::OpenCallback());
}
void InspectableWebContents::SaveToFile(const std::string& url,
                                        const std::string& content,
                                        bool save_as) {
  if (delegate_)
    delegate_->DevToolsSaveToFile(url, content, save_as);
}
void InspectableWebContents::AppendToFile(const std::string& url,