Now pulling WebRTC telemetry pages from https instead of http.

https://codereview.chromium.org/1301653005 changed getUserMedia so it
only works for secure origins, which led gUM to be blocked. This patch
makes us pull our demo pages from https instead of http. Web page
replay seems to respect https, and will play back as https, so this
should solve the problem.

BUG=520765,523517
CQ_EXTRA_TRYBOTS=tryserver.chromium.perf:linux_perf_bisect;tryserver.chromium.perf:mac_perf_bisect;tryserver.chromium.perf:win_perf_bisect;tryserver.chromium.perf:android_nexus5_perf_bisect

Review URL: https://codereview.chromium.org/1313873002

Cr-Commit-Position: refs/heads/master@{#345350}
4 files changed