Previous CL moved these scripts into bin/helper/ because lots of
these scripts are not meant to be directly run by developers (they
are run by other scripts such as
build/android/pylib/junit/test_runner.py). Moving these scripts
back directly into bin/ because this move caused an issue with
incremental builds.

BUG=
TBR=pauljensen@chromium.org

Review URL: https://codereview.chromium.org/1708383002

Cr-Commit-Position: refs/heads/master@{#376527}