Filter browsers when registering an autofill

It is necessary to make a long click to avoid saving the browser's package name, or to share the page to get the right url.
A filter with browser names would prevent this error.

Start by locating the Android autofill registration entry point and the handling of shared pages or long-click submissions. Trace how browser package names and URLs are captured; done means browser package names are filtered out and the intended page URL is retained.

Written by the indexing model from the issue text.