Revert of Collecting encode_time_ms for each frame

Revert of Collecting encode_time_ms for each frame (patchset #13 id:220001 of https://codereview.webrtc.org/1374233002/ )

Reason for revert:
Breaks EndToEndTest.AssignsTransportSequenceNumbers in video_engine_tests
on several bots:
http://build.chromium.org/p/client.webrtc/builders/Linux64%20Debug/builds/5507
http://build.chromium.org/p/client.webrtc/builders/Mac64%20Debug/builds/4815
http://build.chromium.org/p/client.webrtc/builders/Win%20SyzyASan/builds/3272
http://build.chromium.org/p/client.webrtc/builders/Linux%20Memcheck/builds/4414

It seems very unfortunate that it breaks on _exactly_ the bot configs that aren't covered by the CQ trybots.

Original issue's description:
> Collecting encode_time_ms for each frame.
>
> Also, in Sample struct, replacing double with the original type.
> It makes more sense to save the original data as truthful as possible, and then
> convert it to double later if necessary (in the plot script).
>
> Committed: https://crrev.com/092b13384e57b33e2003d9736dfa1f491e76f938
> Cr-Commit-Position: refs/heads/master@{#10184}

TBR=sprang@webrtc.org,pbos@webrtc.org,mflodman@webrtc.org,asapersson@webrtc.org,ivica@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/810447972425e890bc7911af27f894b86e9b7e6f
Cr-Commit-Position: refs/heads/master@{#10185}

[kjellander_webrtc, 2015-10-06 18:33:44]

Created Revert of Collecting encode_time_ms for each frame

[commit-bot: I haz the power, 2015-10-06 18:34:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1383283005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1383283005/1

[commit-bot: I haz the power, 2015-10-06 18:34:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-06 18:34:22]

Patchset 1 (id:??) landed as
https://crrev.com/810447972425e890bc7911af27f894b86e9b7e6f
Cr-Commit-Position: refs/heads/master@{#10185}

[ivica, 2015-10-07 09:42:51]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/1390163002/ by ivica@webrtc.org.

The reason for reverting is: The reverted commit didn't affect the tests, but
the one before: https://codereview.webrtc.org/1385563005/

I've run the test that was failing
(EndToEndTest.AssignsTransportSequenceNumbers) locally multiple times, and it
works fine (finishes successfully in 150-170ms)..