Update tests for chrome, as MediaStream label, ended attributes and stop() method will be removed

Also CL: https://codereview.chromium.org/1312213006/
depends on these CL to commit first.

Intent to Remove:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/LcZGlM9OBqs

Intent to Remove, which became an Intent to Deprecate:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/s0UsMk8i2YM/WpepA4w3mPEJ

BUG=338500

Review URL: https://codereview.chromium.org/1344753002

Cr-Commit-Position: refs/heads/master@{#349094}
6 files changed