Removed hangup testing from AppRTC test.

Removed hangup testing from AppRTC test.

I didn't realize the test actually hangs up the call as well. How
prudent of it! Now that the hangup code changed and isn't readily
available from the global namespace, I'll just remove it. Checking that
we can hang up isn't the most important thing anyway.

BUG=None
TBR=jiayl@chromium.org

Committed: https://crrev.com/0c003ba4567708959cf18f8d983ad37635370259
Cr-Commit-Position: refs/heads/master@{#311466}

[phoglund_chromium, 2015-01-14 12:15:14]

The CQ bit was checked by phoglund@chromium.org

[commit-bot: I haz the power, 2015-01-14 12:15:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/832593003/1

[commit-bot: I haz the power, 2015-01-14 13:07:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-14 13:07:59]

Patchset 1 (id:??) landed as
https://crrev.com/0c003ba4567708959cf18f8d983ad37635370259
Cr-Commit-Position: refs/heads/master@{#311466}