Rename screenshare test.

Rename screenshare test.

Renamed the test to reflect what is actually tested. What the old test
did I don't know since there has never been possible to use screenshare
with two temporal layers in VP9.

BUG=chromium:554515
Committed: https://crrev.com/464c0878d915aed3ea9abc799ad08bf53791a0fd
Cr-Commit-Position: refs/heads/master@{#10631}

[philipel1, 2015-11-12 14:11:31]

philipel@google.com changed reviewers:
+ philipel@google.com, sprang@webrtc.org

[sprang_webrtc, 2015-11-12 14:34:19]

sprang@webrtc.org changed reviewers:
+ pbos@webrtc.org

[sprang_webrtc, 2015-11-12 14:34:20]

lol
lgtm
+pbos as owner

[sprang_webrtc, 2015-11-12 14:34:21]

lol
lgtm
+pbos as owner

[pbos-webrtc, 2015-11-12 14:36:33]

A++/10, lgtm, ship it

[philipel, 2015-11-12 14:39:50]

The CQ bit was checked by philipel@webrtc.org

[commit-bot: I haz the power, 2015-11-12 14:40:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1441693002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1441693002/1

[commit-bot: I haz the power, 2015-11-12 16:40:17]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-12 16:40:18]

Try jobs failed on following builders:
  android_arm64_rel on tryserver.webrtc (JOB_TIMED_OUT, no build URL)

[philipel1, 2015-11-13 10:01:28]

The CQ bit was checked by philipel@google.com

[commit-bot: I haz the power, 2015-11-13 10:01:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1441693002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1441693002/1

[commit-bot: I haz the power, 2015-11-13 10:08:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-13 10:08:21]

Patchset 1 (id:??) landed as
https://crrev.com/464c0878d915aed3ea9abc799ad08bf53791a0fd
Cr-Commit-Position: refs/heads/master@{#10631}