gcc 4.7 workaround for __uint16_t

gcc 4.7 workaround for __uint16_t

It seems that with my gcc 4.7 / eglibc 2.11 toolchain, sys/user.h uses
__uint16_t without it necessarily being defined first.  This can be
worked around by simply including sys/types.h first.

BUG=231000
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=281504

[Mostyn Bramley-Moore, 2014-07-04 11:50:43]

@Ricky, jorgelo: PTAL at this small followup to
https://codereview.chromium.org/278583005

[Jorge Lucangeli Obes, 2014-07-07 02:37:13]

lgtm

[Mostyn Bramley-Moore, 2014-07-07 05:57:15]

The CQ bit was checked by mostynb@opera.com

[commit-bot: I haz the power, 2014-07-07 05:57:46]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mostynb@opera.com/371573003/1

[commit-bot: I haz the power, 2014-07-07 07:47:53]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  ios_dbg_simulator on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_dbg_simulator/bui...)

[commit-bot: I haz the power, 2014-07-07 07:50:04]

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

[commit-bot: I haz the power, 2014-07-07 07:50:05]

Try jobs failed on following builders:
  ios_dbg_simulator on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/ios_dbg_simulator/bui...)

[Mostyn Bramley-Moore, 2014-07-07 07:51:23]

The CQ bit was checked by mostynb@opera.com

[commit-bot: I haz the power, 2014-07-07 07:52:34]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mostynb@opera.com/371573003/1

[commit-bot: I haz the power, 2014-07-07 08:20:24]

Change committed as 281504