[Android] Switch chromium bots on chromium.android to gn.
[Android] Switch chromium bots on chromium.android to gn.

This still does not include cronet or webview.

BUG=580129

Review URL: https://codereview.chromium.org/1636003003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#371641}

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