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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 std::string& file_system_path) {
  devtools_indexing_jobs_.erase(request_id);
  base::Value request_id_value(request_id);
  base::Value file_system_path_value(file_system_path);
  inspectable_ontents_->CallClientFunction(
      "DevToolsAPI.indexingDone", &request_id_value, &file_system_path_value,
      nullptr);
}
void WebContents::OnDevToolsSearchCompleted(
    int request_id,
    const std::string& file_system_path,
    const std::vector<std::string>& file_paths) {
  base::ListValue file_paths_value;
  for (const auto& file_path : file_paths) {
    file_paths_value.AppendString(file_path);
  }
  base::Value request_id_value(request_id);
  base::Value file_system_path_value(file_system_path);
  inspectable_ontents_->CallClientFunction(
      "DevToolsAPI.searchCompleted", &request_id_value, &file_system_path_value,
      &file_paths_value);
}
void WebContents::SetHtmlApiFullscreen(bool enter_fullscreen) {