<!--  As an open source project with a dedicated but small maintainer team, it can sometimes take a long time for issues to be addressed so please be patient and we will get back to you as soon as we can.
-->

### Preflight Checklist
<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->

* [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:**
  * 11.0.0-beta.13
  * 10.0.1
* **Operating System:**
  * Windows 10 (2004)

When calling [`navigator.clipboard.read()`](https://developer.mozilla.org/en-US/docs/Web/API/Clipboard/read) in the renderer process, the session's permission handler receives a request for the permission "unknown".

### Expected Behavior
The permission handler should receive a request for "clipboard-read" permission.

### Actual Behavior
The permission handler receives a request for "unknown" permission.

### To Reproduce
Electron Fiddler: https://gist.github.com/5046d997fb4648edd08ad8a2645e84a0

shell/common/gin_converters/content_converter.cc
content::WebContents* web_contents,
                              const content::CustomContextMenuContext& context,
                              const std::vector<content::MenuItem>& menu) {
  std::vector<v8::Local<v8::Value>> v8_menu;
  v8_menu.reserve(menu.size());
  for (const auto& menu_item : menu)
    v8_menu.push_back(MenuItemToV8(isolate, web_contents, context, menu_item));
  return gin::ConvertToV8(isolate, v8_menu);
}
}  
namespace gin {
template <>
struct Converter<ui::MenuSourceType> {
  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
                                   const ui::MenuSourceType& in) {
    switch (in) {
      case ui::MENU_SOURCE_MOUSE:
        return StringToV8(isolate, "mouse");
      case ui::MENU_SOURCE_KEYBOARD:
        return StringToV8(isolate, "keyboard");
      case ui::MENU_SOURCE_TOUCH:
        return StringToV8(isolate, "touch");
      case ui::MENU_SOURCE_TOUCH_EDIT_MENU:
        return StringToV8(isolate, "touchMenu");
      default:
        return StringToV8(isolate, "none");
    }
  }
};
v8::Local<v8::Value> Converter<content::MenuItem::Type>::ToV8(