Since #19488, the network service is enabled and the old path has been deleted. Some features are broken as a result and will need to be fixed before 8.0.0. This is a tracking issue for those features.

- [x] webRequest API (zcbenz)
- [x] service workers on file protocol (#20132)
- [x] session.clearAuthCache - tests (#20015)
- [x] session.getBlobData (#20041)
- [x] session.setUserAgent (#20014)
- [x] custom standard schemes / registerSchemesAsPrivileged
- [x] Rewire Login Handler from NetworkDelegate into ProxyingURLLoaderFactory
- [x] fix 'login' event not firing on net requests

cc @deepak1556 @jkleinsc @zcbenz 
shell/browser/api/atom_api_session.cc
if (protocol_.IsEmpty()) {
    v8::Local<v8::Value> handle;
    handle = ProtocolNS::Create(isolate, browser_context()).ToV8();
    protocol_.Reset(isolate, handle);
  }
  return v8::Local<v8::Value>::New(isolate, protocol_);
}
v8::Local<v8::Value> Session::WebRequest(v8::Isolate* isolate) {
  if (web_request_.IsEmpty()) {
    auto handle = WebRequestNS::Create(isolate, browser_context());
    web_request_.Reset(isolate, handle.ToV8());
  }
  return v8::Local<v8::Value>::New(isolate, web_request_);
}
v8::Local<v8::Value> Session::NetLog(v8::Isolate* isolate) {
  if (net_log_.IsEmpty()) {
    auto handle = electron::api::NetLog::Create(isolate, browser_context());
    net_log_.Reset(isolate, handle.ToV8());
  }
  return v8::Local<v8::Value>::New(isolate, net_log_);
}
static void StartPreconnectOnUI(
    scoped_refptr<AtomBrowserContext> browser_context,
    const GURL& url,
    int num_sockets_to_preconnect) {
  std::vector<predictors::PreconnectRequest> requests = {
      {url.GetOrigin(), num_sockets_to_preconnect, net::NetworkIsolationKey()}};
  browser_context->GetPreconnectManager()->Start(url, requests);
}
void Session::Preconnect(const mate::Dictionary& options,