Revert of Disable failing tests on Mac 10.10 Release (ATI)

Revert of Disable failing tests on Mac 10.10 Release (ATI) (patchset #1 id:1 of https://codereview.chromium.org/1456863003/ )

Reason for revert:
Per research and discussion on http://crbug.com/557929, we are pretty sure the bot is to blame and NOT the CLs or these tests.

Original issue's description:
> Disable failing tests on Mac 10.10 Release (ATI)
>
> Failing tests on Mac OS:
>   CastStreamingApiTestWithPixelOutput.EndToEnd
>   TabCaptureApiPixelTest.EndToEndThroughWebRTC
>   TabCaptureApiPixelTest.EndToEndWithoutRemoting
>
> BUG=557929
> TBR=hubbe@chromium.org, miu@chromium.org
>
> Committed: https://crrev.com/872e59f9875efaad8b73b44cf2707c0a57d52244
> Cr-Commit-Position: refs/heads/master@{#360460}

TBR=hubbe@chromium.org,hcarmona@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=557929
Committed: https://crrev.com/e13dcf9353b40f8f0d10d3aecbfdea145928fb10
Cr-Commit-Position: refs/heads/master@{#360634}

[miu, 2015-11-19 02:51:07]

Created Revert of Disable failing tests on Mac 10.10 Release (ATI)

[miu, 2015-11-19 02:52:18]

The CQ bit was checked by miu@chromium.org

[miu, 2015-11-19 02:52:49]

The CQ bit was unchecked by miu@chromium.org

[miu, 2015-11-19 18:47:23]

Description was changed from

==========
Revert of Disable failing tests on Mac 10.10 Release (ATI) (patchset #1 id:1 of
https://codereview.chromium.org/1456863003/ )

Reason for revert:
Tests indicated other CL in blamelist was to blame.

I will both revert the other CL in the blamelist
(https://codereview.chromium.org/1441353003) AND am reverting this CL to confirm
the tests go green again.

See http://crbug.com/557929 for more details.

Original issue's description:
> Disable failing tests on Mac 10.10 Release (ATI)
> 
> Failing tests on Mac OS:
>   CastStreamingApiTestWithPixelOutput.EndToEnd
>   TabCaptureApiPixelTest.EndToEndThroughWebRTC
>   TabCaptureApiPixelTest.EndToEndWithoutRemoting
> 
> BUG=557929
> TBR=hubbe@chromium.org, miu@chromium.org
> 
> Committed: https://crrev.com/872e59f9875efaad8b73b44cf2707c0a57d52244
> Cr-Commit-Position: refs/heads/master@{#360460}

TBR=hubbe@chromium.org,hcarmona@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=557929
==========

to

==========
Revert of Disable failing tests on Mac 10.10 Release (ATI) (patchset #1 id:1 of
https://codereview.chromium.org/1456863003/ )

Reason for revert:
Per research and discussion on http://crbug.com/557929, we are pretty sure the
bot is to blame and NOT the CLs or these tests.

Original issue's description:
> Disable failing tests on Mac 10.10 Release (ATI)
> 
> Failing tests on Mac OS:
>   CastStreamingApiTestWithPixelOutput.EndToEnd
>   TabCaptureApiPixelTest.EndToEndThroughWebRTC
>   TabCaptureApiPixelTest.EndToEndWithoutRemoting
> 
> BUG=557929
> TBR=hubbe@chromium.org, miu@chromium.org
> 
> Committed: https://crrev.com/872e59f9875efaad8b73b44cf2707c0a57d52244
> Cr-Commit-Position: refs/heads/master@{#360460}

TBR=hubbe@chromium.org,hcarmona@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=557929
==========

[miu, 2015-11-19 18:48:23]

The CQ bit was checked by miu@chromium.org

[commit-bot: I haz the power, 2015-11-19 18:49:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1462603003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1462603003/1

[commit-bot: I haz the power, 2015-11-19 18:50:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-19 18:51:35]

Patchset 1 (id:??) landed as
https://crrev.com/e13dcf9353b40f8f0d10d3aecbfdea145928fb10
Cr-Commit-Position: refs/heads/master@{#360634}