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### 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::Isolate* isolate,
    const content::PermissionType& val) {
  using PermissionType = electron::WebContentsPermissionHelper::PermissionType;
  switch (val) {
    case content::PermissionType::MIDI_SYSEX:
      return StringToV8(isolate, "midiSysex");
    case content::PermissionType::NOTIFICATIONS:
      return StringToV8(isolate, "notifications");
    case content::PermissionType::GEOLOCATION:
      return StringToV8(isolate, "geolocation");
    case content::PermissionType::AUDIO_CAPTURE:
    case content::PermissionType::VIDEO_CAPTURE:
      return StringToV8(isolate, "media");
    case content::PermissionType::PROTECTED_MEDIA_IDENTIFIER:
      return StringToV8(isolate, "mediaKeySystem");
    case content::PermissionType::MIDI:
      return StringToV8(isolate, "midi");
    default:
      break;
  }