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### Preflight Checklist
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* [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
v8::Local<v8::Value> val,
                                          content::Referrer* out) {
  gin_helper::Dictionary dict;
  if (!ConvertFromV8(isolate, val, &dict))
    return false;
  if (!dict.Get("url", &out->url))
    return false;
  if (!dict.Get("policy", &out->policy))
    return false;
  return true;
}
bool Converter<content::NativeWebKeyboardEvent>::FromV8(
    v8::Isolate* isolate,
    v8::Local<v8::Value> val,
    content::NativeWebKeyboardEvent* out) {
  gin_helper::Dictionary dict;
  if (!ConvertFromV8(isolate, val, &dict))
    return false;
  if (!ConvertFromV8(isolate, val, static_cast<blink::WebKeyboardEvent*>(out)))
    return false;
  dict.Get("skipInBrowser", &out->skip_in_browser);
  return true;
}
v8::Local<v8::Value> Converter<content::NativeWebKeyboardEvent>::ToV8(