cros: Remove unused low memory margin code from sandbox and zygote

cros: Remove unused low memory margin code from sandbox and zygote

This code is unused - it was probably added long ago when we were trying to
figure out the correct value for the memory margin.  Removing it will make
it easier to remove the setuid sandbox.

BUG=312388
TEST=compiles, usual browser_tests
R=jln@chromium.org
TBR=joi@chromium.org for removing an unused method from content/public/browser/zygote_host_linux.h

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=231611

[James Cook, 2013-10-28 21:33:32]

jln, PTAL

jorgelo - just FYI

[Jorge Lucangeli Obes, 2013-10-28 21:45:23]

On 2013/10/28 21:33:32, James Cook wrote:
> jln, PTAL
> 
> jorgelo - just FYI

LGTM FWIW. I'll follow up to remove that file from our system.

[jln (very slow on Chromium), 2013-10-28 21:51:14]

Thanks, lgtm!

[commit-bot: I haz the power, 2013-10-28 22:29:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jamescook@chromium.org/49843002/1

[commit-bot: I haz the power, 2013-10-29 03:23:29]

Retried try job too often on win7_aura for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win7_aura&...

[commit-bot: I haz the power, 2013-10-29 14:50:31]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jamescook@chromium.org/49843002/1

[commit-bot: I haz the power, 2013-10-29 18:36:13]

Retried try job too often on win7_aura for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win7_aura&...

[James Cook, 2013-10-29 19:28:35]

Committed patchset #1 manually as r231611 (presubmit successful).