[Android] Consolidate and upgrade OWNERS for test files
Part of a bigger change that can be seen here for context
https://codereview.chromium.org/27311005/

BUG=308421

Review URL: https://codereview.chromium.org/26880007

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@230400 4ff67af0-8c30-449e-8e8b-ad334ec8d88c