Widevine toggling should prompt for relaunch via button instead of popup

[ShivanKaul]

Description

In brave://settings/extensions, we have a number of settings that users can toggle and that require a browser restart. All of them except Widevine show up a Relaunch button next to the toggle when the setting is changed. Widevine toggling brings up a popup. For uniformity, we should do the same thing across button toggling.

Steps to reproduce

1. Go to brave://settings/extensions
2. Toggle Widevine (default on)

Actual result

See popup asking the user to Relaunch Now

Expected result

A Relaunch button similar to what shows up when Media Router is toggled

Reproduces how often

Easily reproduced

Brave version (brave://version info)

All

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

No response