Revert of Reenable linux_aura on the main builders.

Revert of Reenable linux_aura on the main builders. (https://codereview.chromium.org/136813004/)

Reason for revert:
Failed due to mysterious failures on the Google Chrome Linux bot.

Example:
FAILED: cd ../../chrome; flock -- /tmp/linux_package_lock bash ../out/Release/installer/debian/build.sh -o../out/Release -b ../out/Release -a ia32 -c stable
Staging common install files in '/tmp/deb.build.AEvway'...
eu-strip: while computing checksum for debug information: Invalid argument
Cleaning...

BUG=335451
Original issue's description:
> Reenable linux_aura on the main builders.
> 
> We fixed the browser test slowdown that lead to linux_aura being
> disabled in r235280. (Different test suites are faster or slower, but
> overall, tests run faster.)
> 
> We are turning this on primarily to get perf data; if things look
> acceptable, we hope to cut a dev channel this week.
> 
> BUG=319075, 125106, 303342, 318961
> NOTRY=True
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245415

TBR=
NOTREECHECKS=true
NOTRY=true
BUG=319075, 125106, 303342, 318961
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245429

[Elliot Glaysher, 2014-01-17 06:05:14]

Created Revert of Reenable linux_aura on the main builders.

[commit-bot: I haz the power, 2014-01-17 06:06:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/erg@chromium.org/140823008/1

[commit-bot: I haz the power, 2014-01-17 06:06:51]

Change committed as 245429