Revert of Disable system_health.memory_desktop.browse:media:youtube smoke test

Revert of Disable system_health.memory_desktop.browse:media:youtube smoke test (patchset #1 id:1 of https://codereview.chromium.org/2756073002/ )

Reason for revert:
Root cause should have been fixed now.

Original issue's description:
> Disable system_health.memory_desktop.browse:media:youtube smoke test
> 
> BUG=702455
> TBR=perezju@chromium.org,
> 
> Review-Url: https://codereview.chromium.org/2756073002
> Cr-Commit-Position: refs/heads/master@{#457686}
> Committed: https://chromium.googlesource.com/chromium/src/+/cbed8980f896748f5c453fa3adfc08ab037af449

TBR=nednguyen@chromium.org,nednguyen@google.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=702455

[perezju, 2017-06-14 14:57:44]

The CQ bit was checked by perezju@chromium.org

[perezju, 2017-06-14 14:57:45]

Created Revert of Disable system_health.memory_desktop.browse:media:youtube
smoke test

[commit-bot: I haz the power, 2017-06-14 14:58:14]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-14 15:00:11]

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

[commit-bot: I haz the power, 2017-06-14 15:00:12]

Try jobs failed on following builders:
  ios-device on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device/builds...)
  ios-device-xcode-clang on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device-xcode-...)
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[perezju, 2017-06-14 15:01:21]

On 2017/06/14 at 15:00:12, commit-bot wrote:
> Try jobs failed on following builders:
>   ios-device on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device/builds...)
>   ios-device-xcode-clang on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device-xcode-...)
>   mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

Patch fails to apply. I'll abandon this and create a new CL.