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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
const base::FilePath& file_system_path) {
  if (!inspectable_ontents_)
    return;
  std::string path = file_system_path.AsUTF8Unsafe();
  storage::IsolatedContext::GetInstance()->RevokeFileSystemByPath(
      file_system_path);
  auto* pref_service = GetPrefService(GetDevToolsWebContents());
  DictionaryPrefUpdate update(pref_service, prefs::kDevToolsFileSystemPaths);
  update.Get()->RemoveWithoutPathExpansion(path, nullptr);
  base::Value file_system_path_value(path);
  inspectable_ontents_->CallClientFunction("DevToolsAPI.fileSystemRemoved",
                                                &file_system_path_value,
                                                nullptr, nullptr);
}
void WebContents::DevToolsIndexPath(