Revert "We want Browser"

* Aosp browser is really old and insecure, we are replacing it with Jelly
* Jelly is a simple webview-based browser, so it relies on installed webview,
  which makes it secure as long as webview is updated
* Gello is still alive, it overrides Jelly instead of Browser target

This reverts commit cf571f4f.

Change-Id: Ie5649cc213b3a5409d137d07bd6d1bfcdc789798