Chromecast: moves chromecast_switches.* from common/ to base/.

It's conceptually inappropriate for the switches to live in common/, as most of them are not content-embedder-specific. (See internal uses).

R=halliwell@chromium.org,alokp@chromium.org

Review URL: https://codereview.chromium.org/1151253003

Cr-Commit-Position: refs/heads/master@{#331127}
10 files changed