Fix linking issue for Chromium Browser with Ozone build.

GuessWindowManager is defined only on x11 platform. 
This CL changes the platform check from Linux to X11.

Committed: https://crrev.com/cc2b327bf14ae585424208391fe72f03a860bd83
Cr-Commit-Position: refs/heads/master@{#291612}

[Alexei Svitkine (slow), 2014-08-23 15:18:33]

LGTM

https://codereview.chromium.org/500713002/diff/1/chrome/browser/metrics/chrom...
File chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc (right):

https://codereview.chromium.org/500713002/diff/1/chrome/browser/metrics/chrom...
chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc:33: #include
"ui/base/x/x11_util.h"
Nit: Should this check the X11 ifdef too?

[kondapallykalyan, 2014-08-23 18:20:57]

https://codereview.chromium.org/500713002/diff/1/chrome/browser/metrics/chrom...
File chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc (right):

https://codereview.chromium.org/500713002/diff/1/chrome/browser/metrics/chrom...
chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.cc:33: #include
"ui/base/x/x11_util.h"
On 2014/08/23 15:18:32, Alexei Svitkine wrote:
> Nit: Should this check the X11 ifdef too?

Done.

[kalyank_, 2014-08-23 22:47:53]

The CQ bit was checked by kalyan.kondapally@chromium.org

[commit-bot: I haz the power, 2014-08-23 22:48:41]

CQ is trying da patch. Follow status at

https://chromium-status.appspot.com/cq/kalyan.kondapally@intel.com/500713002/...

[commit-bot: I haz the power, 2014-08-23 23:31:11]

Committed patchset #2 (20001) as dcf9be6e1f664fd09b38a00f96534b353d18f3f1

[commit-bot: I haz the power, 2014-09-10 02:32:12]

Patchset 2 (id:??) landed as
https://crrev.com/cc2b327bf14ae585424208391fe72f03a860bd83
Cr-Commit-Position: refs/heads/master@{#291612}