Refactored the test WebRtcBrowserTest.CanForwardRemoteStream

Refactored the test WebRtcBrowserTest.CanForwardRemoteStream
This test now only use 2 peerconnections. Furthermore, it only creates one mediastream that is sent from pc1 to pc2. When the stream is playing on pc2, it is cloned and sent back to pc1. The purpose of this refactoring is no reduce the CPU requirement and the number of streams sent to fix flakiness problems.

This cl removes the test CanForwardRemoteStream720 since it test the same thing as CanForwardRemoteStream but with a higher video resolution.

BUG=469819
Committed: https://crrev.com/a3cde69715119e41a051cf62eb2cb799121cc8cb
Cr-Commit-Position: refs/heads/master@{#322362}

[perkj_chrome, 2015-03-26 09:32:51]

perkj@chromium.org changed reviewers:
+ phoglund@chromium.org

[perkj_chrome, 2015-03-26 09:33:06]

Can you please review?

[phoglund_chromium, 2015-03-26 09:59:15]

lgtm

https://codereview.chromium.org/1032953002/diff/1/content/test/data/media/pee...
File content/test/data/media/peerconnection-call.html (right):

https://codereview.chromium.org/1032953002/diff/1/content/test/data/media/pee...
content/test/data/media/peerconnection-call.html:161: // The stream sent from
pc1 to pc2 is cloned from the stream received on pc2
Nit: pull up comment to previous line.

[perkj_chrome, 2015-03-26 11:08:51]

The CQ bit was checked by perkj@chromium.org

[perkj_chrome, 2015-03-26 11:08:51]

The patchset sent to the CQ was uploaded after l-g-t-m from
phoglund@chromium.org
Link to the patchset: https://codereview.chromium.org/1032953002/#ps20001
(title: "Fix nits and enabled on tsan")

[commit-bot: I haz the power, 2015-03-26 11:09:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1032953002/20001

[commit-bot: I haz the power, 2015-03-26 12:07:31]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-26 12:08:06]

Patchset 2 (id:??) landed as
https://crrev.com/a3cde69715119e41a051cf62eb2cb799121cc8cb
Cr-Commit-Position: refs/heads/master@{#322362}