We should update the ChooserContextBase class and subclasses to use base::Value instead of base::DictionaryValue, since it is going to be removed eventually.

Links for reference:
https://cs.chromium.org/chromium/src/base/values.h?rcl=50a0e60996285b5bf8a2f579738b3265e7536243&l=71
https://chromium-review.googlesource.com/c/chromium/src/+/1399468/6/chrome/browser/permissions/chooser_context_base.cc#36