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### Issue Details

* **Electron Version:**
  * 7.0.0
* **Operating System:**
  * Windows 10 (1903)
* **Last Known Working Electron version:**
  * 6.0.12

### Expected Behavior
session.defaultSession.cookies.set(cookie) should set a cookie that can be then retrieved using session.defaultSession.cookies.get(filter)

### Actual Behavior
session.defaultSession.cookies.set doesnt seem to be doing anything.

### To Reproduce
Gist:
This gist logs an empty array in 7.0.0, In 6.0.12, it logs the cookie object that was set:
https://gist.github.com/sgd2z/af6abf3cea4bddb1cd62a3e8265c359f

shell/browser/api/atom_api_cookies.cc
Emit("changed", gin::ConvertToV8(isolate(), change.cookie),
       gin::ConvertToV8(isolate(), change.cause),
       gin::ConvertToV8(isolate(),
                        change.cause != net::CookieChangeCause::INSERTED));
}
gin::Handle<Cookies> Cookies::Create(v8::Isolate* isolate,
                                     AtomBrowserContext* browser_context) {
  return gin::CreateHandle(isolate, new Cookies(isolate, browser_context));
}
void Cookies::BuildPrototype(v8::Isolate* isolate,
                             v8::Local<v8::FunctionTemplate> prototype) {
  prototype->SetClassName(gin::StringToV8(isolate, "Cookies"));
  gin_helper::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
      .SetMethod("get", &Cookies::Get)
      .SetMethod("remove", &Cookies::Remove)
      .SetMethod("set", &Cookies::Set)
      .SetMethod("flushStore", &Cookies::FlushStore);
}
}  
}