Chromecast: always disable "shrinks viewport content to fit."

The setting is enabled by default for Android builds, but not
practical for Chromecast on Android.

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

Review URL: https://codereview.chromium.org/606453003

Cr-Commit-Position: refs/heads/master@{#296600}
2 files changed