base::{Bind,Callback,Closure}() have been deprecatedfor a while now,
are finally gone on Chromium 92, so it would be good to migrate all
current instances in the code (and stop introducing new ones) to the
Once/Repeating variants instead to easy further rebases.
This patch changes ALL instances of those old definitions and move
to using the Once variants whenever possible (as they are preferred)
and Repeating variants in every other case.
Last, this patch also makes some changes in brave_rewards_api.{h,cc}
to use weak pointers instead of base::Unretained() when binding
callbacks, for extra safety (and consistency with existing code).
[1] https://chromium-review.googlesource.com/c/chromium/src/+/2867526
Resolves https://github.com/brave/brave-browser/issues/15855
Mario Sanchez Prada
10c9ed746e