Revert of Put LayoutAnalyzer back behind disabled-by-default-blink.debug.layout.

Revert of Put LayoutAnalyzer back behind disabled-by-default-blink.debug.layout. (patchset #4 id:60001 of https://codereview.chromium.org/1120833003/)

Reason for revert:
crbug.com/483390  Looks like this change may have caused the test on that bug to fail on all bots.  A speculative revert might help resolve that.  Will roll back in otherwise.

BUG=483390
Original issue's description:
> Put LayoutAnalyzer back behind disabled-by-default-blink.debug.layout.
> 
> Another CL will remove the UMA.
> 
> When the deep reports category is ready, this will move over to that.
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=194781

TBR=esprehn@chromium.org,benjhayden@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

[Noel Gordon, 2015-05-01 08:10:17]

Created Revert of Put LayoutAnalyzer back behind
disabled-by-default-blink.debug.layout.

[commit-bot: I haz the power, 2015-05-01 08:10:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1122453002/1

[commit-bot: I haz the power, 2015-05-01 08:11:04]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=194796

[commit-bot: I haz the power, 2015-05-01 08:11:10]

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

[Noel Gordon, 2015-05-06 08:13:42]

Cane we see a LGTM here.