Make the GN use_glib argument not user-selectable.

Make the GN use_glib argument not user-selectable.

The interaction between use_ozone and use_glib was
awkward when they were both declared as GN arguments,
and there doesn't seem to be a good reason for
use_glib to be user-togglable.

R=brettw@chromium.org
BUG=

Committed: https://crrev.com/9de174326a0c2a391ce4a6712f70e53712536bc3
Cr-Commit-Position: refs/heads/master@{#333544}

[brettw, 2015-06-09 15:34:19]

lgtm

[Dirk Pranke, 2015-06-09 15:54:13]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-06-09 15:56:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1170873003/1

[commit-bot: I haz the power, 2015-06-09 16:06:15]

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

[commit-bot: I haz the power, 2015-06-09 16:06:16]

Try jobs failed on following builders:
  android_chromium_gn_compile_dbg on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)
  android_chromium_gn_compile_rel on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)
  linux_chromium_gn_chromeos_rel on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_gn_dbg on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_gn_rel on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Dirk Pranke, 2015-06-09 18:24:29]

The CQ bit was checked by dpranke@chromium.org

[Dirk Pranke, 2015-06-09 18:24:30]

The patchset sent to the CQ was uploaded after l-g-t-m from brettw@chromium.org
Link to the patchset: https://codereview.chromium.org/1170873003/#ps20001
(title: "fix references to use_cairo and use_pango")

[commit-bot: I haz the power, 2015-06-09 18:24:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1170873003/20001

[commit-bot: I haz the power, 2015-06-09 19:05:04]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-09 19:06:05]

Patchset 2 (id:??) landed as
https://crrev.com/9de174326a0c2a391ce4a6712f70e53712536bc3
Cr-Commit-Position: refs/heads/master@{#333544}