Chromecast Android buildfix: rework CommandLine initialization logic.

See: https://codereview.chromium.org/615153002

R=lcwu@chromium.org,byungchul@chromium.org
BUG=None
NOTRY=true

Review URL: https://codereview.chromium.org/625823002

Cr-Commit-Position: refs/heads/master@{#298079}
2 files changed