[Android] Remove build/android/buildbot/OWNERS.
[Android] Remove build/android/buildbot/OWNERS.

Most of these files aren't heavily used any more, cmp@ and navabi@ are
no longer on chromium, and I'm an OWNER in both of the parent directories.
Adios, noparent.

BUG=

Review URL: https://codereview.chromium.org/1350433002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#349045}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk