Revert of Reenable DevToolsSanityTest.TestDeviceEmulation.

Revert of Reenable DevToolsSanityTest.TestDeviceEmulation. (patchset #1 id:1 of https://codereview.chromium.org/564763002/)

Reason for revert:
Fails on the main waterfall on Windows and Linux:

https://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20(dbg)(2)/builds/22510
https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20(dbg)(1)/builds/33246

Original issue's description:
> Reenable DevToolsSanityTest.TestDeviceEmulation.
>
> BUG=397889
> TBR=pfeldman@chromium.org
>
> Committed: https://crrev.com/8844a8eba4465ff5f66bff5b7db195a0192625c3
> Cr-Commit-Position: refs/heads/master@{#294375}

TBR=pfeldman@chromium.org,dgozman@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=397889
Committed: https://crrev.com/96e8a26d07980ed7314c9784208e4a30bdc8f10d
Cr-Commit-Position: refs/heads/master@{#294431}

[nasko, 2014-09-11 18:35:16]

Created Revert of Reenable DevToolsSanityTest.TestDeviceEmulation.

[commit-bot: I haz the power, 2014-09-11 18:40:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/562343002/1

[commit-bot: I haz the power, 2014-09-11 18:44:08]

Committed patchset #1 (id:1) as 5bede5121a22cf89cbc57c92c3e3e4ea48c17d21

[commit-bot: I haz the power, 2014-09-11 19:09:15]

Patchset 1 (id:??) landed as
https://crrev.com/96e8a26d07980ed7314c9784208e4a30bdc8f10d
Cr-Commit-Position: refs/heads/master@{#294431}