Resolvesbrave/brave-browser#52296
Implements Brave's customized version of Chromium's v2 clear browsing
data dialog with the following enhancements:
* Add two-tab layout ("Clear data" and "On exit") for better UX
* Customize time picker with Leo design tokens and chip styling
* Add cr-chip customization via chromium_src override
* Remove feature flag to enable v2 dialog by default
* Some patch is added to reuse upstream's method by exporting
Simon Hong
29d4eb4164