Not everyone builds Chromium for arm so then it's practical to be
able to use a smaller SDK package without arm support included.

This also removes some samples that should not be needed.

Recipe-Nontrivial-Roll: chromiumos
Change-Id: I10f64d8907600fe79d3051083d100a7562d3a797
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1752202
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>