App store type in a legacy app install ad.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/enums/legacy_app_install_ad_app_store.proto)

| Enums ||
|---|---|
| ## `APPLE_APP_STORE` | Apple iTunes. |
| ## `CN_APP_STORE` | The app is hosted in a Chinese app store. |
| ## `GOOGLE_PLAY` | Google Play. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |
| ## `WINDOWS_PHONE_STORE` | Windows Phone Store. |
| ## `WINDOWS_STORE` | Windows Store. |