* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 7.0.0-beta.7
* **Operating System:**
  * Windows 10
* **Last Known Working Electron version:**
  * 6

### Expected Behavior
Cookies are received

### Actual Behavior
response.headers["set-cookie"] never contains cookies

### To Reproduce
Do a request using the net module as described here: https://electronjs.org/docs/api/net
to any site that will return cookies.

shell/browser/api/atom_api_url_loader.cc
buffer_.resize(buffer.size());
    memcpy(buffer_.data(), buffer.data(), buffer_.size());
  }
  ~BufferDataSource() override = default;
 private:
  
  uint64_t GetLength() const override { return buffer_.size(); }
  ReadResult Read(uint64_t offset, base::span<char> buffer) override {
    ReadResult result;
    if (offset <= buffer_.size()) {
      size_t readable_size = buffer_.size() - offset;
      size_t writable_size = buffer.size();
      size_t copyable_size = std::min(readable_size, writable_size);
      if (copyable_size > 0) {
        memcpy(buffer.data(), &buffer_[offset], copyable_size);
      }
      result.bytes_read = copyable_size;
    } else {
      NOTREACHED();
      result.result = MOJO_RESULT_OUT_OF_RANGE;
    }
    return result;
  }
  std::vector<char> buffer_;
};
class JSChunkedDataPipeGetter : public gin::Wrappable<JSChunkedDataPipeGetter>,
                                public network::mojom::ChunkedDataPipeGetter {
 public:
  static gin::Handle<JSChunkedDataPipeGetter> Create(