Firebase Analytics (Web) does not work in Non-browser Envs

* Operating System version: macOS Mojave
* Browser version: Electron 5.0.10
* Firebase SDK version: 7.1.0
* Firebase Product: Analytics

Describe the problem

#### Steps to reproduce:
On Electron, Analytics seems to load correctly but no events, sessions or users are logged.
#### Relevant Code:

Include Firebase using the `script` tag (as importing the module from NPM fails due to gRPC).

```html

firebase.initializeApp({
...
});
firebase.analytics()

```

While Firebase seems to load, and a new `googletagmanager` gets installed on the page, not analytics events seem to reach Firebase dashboard.