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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
if (!success && loader_->NetError() == net::ERR_INSUFFICIENT_RESOURCES &&
        retry_delay_ < kMaxBackoffDelay) {
      const base::TimeDelta delay =
          GetNextExponentialBackoffDelay(retry_delay_);
      LOG(WARNING) << "InspectableWebContents::NetworkResourceLoader id = "
                   << stream_id_
                   << " failed with insufficient resources, retrying in "
                   << delay << "." << std::endl;
      NetworkResourceLoader::Create(
          stream_id_, bindings_, resource_request_, traffic_annotation_,
          std::move(url_loader_factory_), std::move(callback_), delay);
    } else {
      base::DictionaryValue response;
      response.SetInteger("statusCode", response_headers_
                                            ? response_headers_->response_code()
                                            : net::HTTP_OK);
      auto headers = std::make_unique<base::DictionaryValue>();
      size_t iterator = 0;
      std::string name;
      std::string value;
      while (response_headers_ &&
             response_headers_->EnumerateHeaderLines(&iterator, &name, &value))
        headers->SetString(name, value);
      response.Set("headers", std::move(headers));
      std::move(callback_).Run(&response);
    }
    bindings_->loaders_.erase(bindings_->loaders_.find(this));
  }
  void OnRetry(base::OnceClosure start_retry) override {}