Nuke tools/android/loading

In attempt to avoid breaking customtabs_benchmark also move
chrome_setup.py to tools/android/customtabs_benchmark/scripts.

Reason: currently unused, does not comply with presubmit checks, no
plans to develop it further.

Change-Id: I01486f7fcbd663281e43c6db95bd621969a5f7d2
Reviewed-on: https://chromium-review.googlesource.com/c/1366275
Reviewed-by: Matthew Cary <mattcary@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Egor Pasko <pasko@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#614691}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 17f636f29fef89d40edce0727806d72eaf4baba8
144 files changed