Remove deprecated and unused v1 Android unwinder and related code.

Bug: 1393052,1315603
Change-Id: I20fa6932983a18fa84dac59e46ae1f4ce8a1e570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4051024


Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Tushar Agarwal <agarwaltushar@google.com>
Cr-Commit-Position: refs/heads/main@{#1075570}