Set default prod version for apprtc as 2.

Set default prod version for apprtc as 2.
Merge pull request #261 from GoogleChrome/set-apprtc-deploy-version

Set default prod version for apprtc as 2.
Wiring up google analytics events for test results.
Merge pull request #262 from GoogleChrome/testrtc-report

TestRTC: Wiring up google analytics events for test results.
removed lastGetUserMediaError