Download a prebuilt apprtc from google storage instead of building it.

This should work around node.js issues.

To update prebuilt_apprtc.zip:

1. Clone https://github.com/webrtc/apprtc
2. Follow instructions up to grunt build
3. zip -r prebuilt_apprtc.zip apprtc/
4. cp prebuilt_apprtc.zip /.../webrtc.DEPS/prebuilt_apprtc.zip
4. upload_to_google_storage.py prebuilt_apprtc.zip \
       --bucket=chromium-webrtc-resources
   from the webrtc.DEPS dir.

BUG=569494
R=kjellander@chromium.org

Review URL: https://codereview.chromium.org/1565173002 .
8 files changed